🔧 Update cache keys to include insiders

Author: tiangolo

.github/workflows/build-docs.yml

@@ -56,7 +56,7 @@ jobs:
         id: cache
         with:
           path: ${{ env.pythonLocation }}
-          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt') }}-v02
+          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt', 'requirements-docs-insiders.txt') }}-v02
       - name: Install docs extras
         if: steps.cache.outputs.cache-hit != 'true'
         run: pip install -r requirements-docs.txt