test: running django42 tests. (#33144)

.github/workflows/migrations-check.yml

@@ -15,8 +15,17 @@ jobs:
       matrix:
         os: [ ubuntu-20.04 ]
         python-version: [ 3.8 ]
+        # 'pinned' is used to install the latest patch version of Django
+        # within the global constraint i.e. Django==3.2.21 in current case
+        # because we have global constraint of Django<4.2 
+        django-version: ["pinned", "4.2"]
         mongo-version: ["4"]
         mysql-version: ["5.7", "8"]
+        # excluding mysql5.7 with Django 4.2 since Django 4.2 has 
+        # dropped support for MySQL<8
+        exclude:
+          - django-version: "4.2"
+            mysql-version: "5.7"
     services:
       mongo:
         image: mongo:${{ matrix.mongo-version }}
@@ -92,6 +101,14 @@ jobs:
     - name: Install Python dependencies
       run: |
         make dev-requirements
+        if [[ "${{ matrix.django-version }}" != "pinned" ]]; then
+          pip install "django~=${{ matrix.django-version }}.0"
+          pip check # fail if this test-reqs/Django combination is broken
+        fi
+
+    - name: list installed package versions
+      run: |
+        sudo pip freeze
 
     - name: Run Tests
       env:

.github/workflows/unit-tests.yml

@@ -17,7 +17,7 @@ jobs:
           - "3.8"
         django-version:
           - "pinned"
-          #- "4.0"
+          - "4.2"
         # When updating the shards, remember to make the same changes in
         # .github/workflows/unit-tests-gh-hosted.yml
         shard_name: