Fix setup python 3.8 (#4716)

Author: Grantim

.github/workflows/pip-build.yml

@@ -192,7 +192,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          submodules: true
+          submodules: recursive
           ref: ${{needs.setup.outputs.version_tag}}
 
       - name: Checkout Vcpkg ${{env.VCPKG-VERSION}}
@@ -334,7 +334,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          submodules: true
+          submodules: recursive
           ref: ${{needs.setup.outputs.version_tag}}
 
       - name: Python setup

scripts/mrbind-pybind11/install_all_python_versions_ubuntu_reqs.sh

@@ -12,7 +12,11 @@ echo "Python versions: $PY_VERSIONS"
 
 # Install the dependencies.
 for ver in $PY_VERSIONS; do
-    curl -sS https://bootstrap.pypa.io/get-pip.py | python$ver
+    if [[ $ver == 3.8 ]]; then
+        curl -sS https://bootstrap.pypa.io/pip/3.8/get-pip.py | python$ver
+    else
+        curl -sS https://bootstrap.pypa.io/get-pip.py | python$ver
+    fi
     python$ver -m pip install --upgrade -r ./requirements/python.txt
     python$ver -m pip install pytest
 done