chore(tests): fix test failure caused by vcrpy

vcrpy does not use urllib3 correctly. Pin urllib3 until
kevin1024/vcrpy#688 is fixed.

Needed a hack in the "Install dependencies" step to work around a build
failure on Windows: for some reason the Windows builder still had urllib
2.0.2 installed. Could not reproduce this in my Windows VM so I suspect
there is a bug in the way the setup-python GitHub action works.

.github/workflows/main.yml

@@ -80,7 +80,8 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install --upgrade pipenv==2022.10.4
           pipenv install --system --dev
-
+          # Hack: workaround urllib3 still being installed on windows-2022 builder
+          pip install --force-reinstall 'urllib3<2'
       - name: Install Windows dev dependencies
         if: matrix.os == 'windows-2022'
         run: |

Pipfile

@@ -29,5 +29,6 @@ types-oauthlib = "*"
 typing-extensions = "*"
 
 vcrpy = "*"
+urllib3 = "<2" # pin until https://github.com/kevin1024/vcrpy/issues/688 is fixed
 pyfakefs = ">=5.2.0"
 scriv = { version = "*", extras = ["toml"] }