Update tutorials to revise the pip installation command for TFQ 0.7.5 and also avoid a couple of problems (#949)

Changes: 

* Update the `!pip install` command in all the tutorials in
`docs/tutorials/` to use `pip install tensorflow==2.16.2
tensorflow-quantum==0.7.5`.

* Add a pip install of the Python package seaborn to the the MNIST
tutorial. The tutorial imports `seaborn`, but does not install it.
Seaborn seems to come preinstalled in Colab and the DevSite toolchain,
but someone running the notebook outside of those environments may hit a
"module not found" error. By running a `!pip install seaborn` after
installing TF and TFQ, we can not only save users the annoyance; we can
also save future TFQ maintainers the time to debug the problem if they
encounter the missing module during local testing.

* Pin the version of the Gym package installed in
`docs/tutorials/quantum_reinforcement_learning.ipynb`. Previously, the
tutorial simply did a `!pip install gym` without a version constraint.
Versions higher than 0.24.1 are incompatible some code in that tutorial
(at least in TFQ 0.7.5), leading to an error during execution in some
environments. Version 0.24.1 is what is installed by
`scripts/ci_validate_tutorials.sh`; that's how I found the right version
to make things work.

Author: mhucka

docs/tutorials/barren_plateaus.ipynb

@@ -101,16 +101,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {

docs/tutorials/gradients.ipynb

@@ -103,16 +103,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {

docs/tutorials/hello_many_worlds.ipynb

@@ -104,16 +104,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {

docs/tutorials/mnist.ipynb

@@ -101,7 +101,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {
@@ -110,7 +110,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "# Install seaborn for use later in this notebook.\n",
+    "!pip install seaborn\n"
    ]
   },
   {

docs/tutorials/noise.ipynb

@@ -89,16 +89,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {

docs/tutorials/qcnn.ipynb

@@ -106,16 +106,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {

docs/tutorials/quantum_data.ipynb

@@ -103,16 +103,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {

docs/tutorials/quantum_reinforcement_learning.ipynb

@@ -120,16 +120,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {
@@ -178,7 +169,7 @@
    },
    "outputs": [],
    "source": [
-    "!pip install gym"
+    "!pip install gym==0.24.1"
    ]
   },
   {

docs/tutorials/research_tools.ipynb

@@ -96,16 +96,7 @@
    "outputs": [],
    "source": [
     "# In Colab, you will be asked to restart the session after this finishes.\n",
-    "!pip install tensorflow==2.16.2"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "!pip install tensorflow-quantum==0.7.4"
+    "!pip install tensorflow==2.16.2 tensorflow-quantum==0.7.5"
    ]
   },
   {