DO NOT MERGE: pip-install nutpie from main in all CI jobs

Needed until conda-forge ships a nutpie release that supports arviz>=1.0.
Until then the conda env can't co-install nutpie and pymc's arviz pin,
so we get nutpie via pip-from-git-main in every CI job. Once a compatible
nutpie is on conda-forge, drop this commit and put `nutpie>=<that version>`
back into `environment-test.yml` and `windows-environment-test.yml`.

Author: ricardoV94

.github/workflows/tests.yml

@@ -168,6 +168,8 @@ jobs:
         run: |
           pip install "pytensor @ git+https://github.com/pymc-devs/pytensor.git@v3" --no-deps
           pip install -e . --no-deps
+          # Track nutpie main to catch any incompatibility with pymc early.
+          pip install "nutpie @ git+https://github.com/pymc-devs/nutpie@main"
           python --version
           micromamba list
       - name: Run tests
@@ -218,6 +220,8 @@ jobs:
         run: |
           pip install "pytensor @ git+https://github.com/pymc-devs/pytensor.git@v3" --no-deps
           pip install -e . --no-deps
+          # Track nutpie main to catch any incompatibility with pymc early.
+          pip install "nutpie @ git+https://github.com/pymc-devs/nutpie@main"
           python --version
           micromamba list
       - name: Run tests
@@ -276,6 +280,8 @@ jobs:
         run: |
           pip install "pytensor @ git+https://github.com/pymc-devs/pytensor.git@v3" --no-deps
           pip install -e . --no-deps
+          # Track nutpie main to catch any incompatibility with pymc early.
+          pip install "nutpie @ git+https://github.com/pymc-devs/nutpie@main"
           python --version
           micromamba list
       - name: Run tests
@@ -378,6 +384,8 @@ jobs:
         run: |
           pip install "pytensor @ git+https://github.com/pymc-devs/pytensor.git@v3" --no-deps
           pip install -e . --no-deps
+          # Track nutpie main to catch any incompatibility with pymc early.
+          pip install "nutpie @ git+https://github.com/pymc-devs/nutpie@main"
           python --version
           micromamba list
       - name: Run tests