[Python Version Upgrade]: First Pass at Upgrading Track to use python:3.10.6-slim (#3158)

* First pass at upgrading track to python:3.10.6-slim.
Adjusted GH workflow to use Python 3.10.6 for the CI setup.
Edited pylintrc to omit depreicated check for whitespace.
Checked and pinned library versions for requirements.txt and requirements-generator.txt
Re-tested all exercises to see if they'd explode.

* pylint 2.14.5 needs astroid 2.12.

* Upgraded JinJa2 to latest, pinned astroid to <=2.12.0.

* Dropping support for python 3.6, adding python 3.10.6 to version matrix.

* Pinned version of JinJa2 to 3.1.2

.github/workflows/ci-workflow.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: 3.10.6
 
     - name: Download & Install dependencies
       run: |
@@ -53,7 +53,7 @@ jobs:
     needs: housekeeping
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9, 3.10.6]
     steps:
     - uses: actions/checkout@v3
 
@@ -66,7 +66,7 @@ jobs:
       run: pip install dataclasses
 
     - name: Install pytest
-      run: pip install pytest~=7.0.1
+      run: pip install pytest~=7.1.2
 
     - name: Check exercises
       run: |