Merge pull request #408 from rollbar/python_2_ci

Pinned Python 2 CI tests to legacy version of dependencies

.github/workflows/ci.yml

@@ -232,5 +232,27 @@ jobs:
         if: ${{ contains(matrix.framework, 'FASTAPI_VERSION') }}
         run: pip install fastapi==$FASTAPI_VERSION
 
+      - name: Install Python 2 dependencies
+        if: ${{ contains(matrix.python-version, '2.7') }}
+        # certifi dropped support for Python 2 in 2020.4.5.2 but only started
+        # using Python 3 syntax in 2022.5.18. 2021.10.8 is the last release with
+        # Python 2 support.
+        run: pip install certifi==2021.10.8
+
+      - name: Install Python 3.4 dependencies
+        if: ${{ contains(matrix.python-version, '3.4') }}
+        # certifi uses the 'typing' from Python 3.5 module starting in 2022.5.18
+        run: pip install certifi==2021.10.8 "typing-extensions<4"
+
+      - name: Install Python 3.5 dependencies
+        if: ${{ contains(matrix.python-version, '3.5') }}
+        # typing-extensions dropped support for Python 3.5 in version 4
+        run: pip install "typing-extensions<4"
+
+      - name: Install Python 3.6 dependencies
+        if: ${{ contains(matrix.python-version, '3.6') }}
+        # typing-extensions dropped support for Python 3.6 in version 4.2
+        run: pip install "typing-extensions<4.2"
+
       - name: Run tests
         run: python setup.py test