Updated files with 'repo_helper'.

.github/workflows/mypy.yml

@@ -42,7 +42,17 @@ jobs:
         with:
           python-version: "3.8"
 
-      - name: Install dependencies 🔧
+      - name: Install dependencies (Linux) 🔧
+        if: ${{ matrix.os == 'ubuntu-20.04' && steps.changes.outputs.code == 'true' }}
+        run: |
+          pip wheel git+https://github.com/python-cffi/cffi
+          python -VV
+          python -m site
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install --upgrade tox~=3.0 virtualenv!=20.16.0
+
+      - name: Install dependencies (Windows) 🔧
+        if: ${{ matrix.os != 'ubuntu-20.04' && steps.changes.outputs.code == 'true' }}
         run: |
           python -VV
           python -m site