👷 Fix logic for when to install and use MkDocs Insiders (#11372)

.github/workflows/build-docs.yml

@@ -49,7 +49,7 @@ jobs:
         id: cache
         with:
           path: ${{ env.pythonLocation }}
-          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt', 'requirements-docs-tests.txt') }}-v06
+          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt', 'requirements-docs-tests.txt') }}-v07
       - name: Install docs extras
         if: steps.cache.outputs.cache-hit != 'true'
         run: pip install -r requirements-docs.txt
@@ -90,12 +90,12 @@ jobs:
         id: cache
         with:
           path: ${{ env.pythonLocation }}
-          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt', 'requirements-docs-tests.txt') }}-v06
+          key: ${{ runner.os }}-python-docs-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'requirements-docs.txt', 'requirements-docs-tests.txt') }}-v08
       - name: Install docs extras
         if: steps.cache.outputs.cache-hit != 'true'
         run: pip install -r requirements-docs.txt
       - name: Install Material for MkDocs Insiders
-        if: ( github.event_name != 'pull_request' || github.secret_source != 'Actions' ) && steps.cache.outputs.cache-hit != 'true'
+        if: ( github.event_name != 'pull_request' || github.secret_source == 'Actions' ) && steps.cache.outputs.cache-hit != 'true'
         run: |
           pip install git+https://${{ secrets.FASTAPI_MKDOCS_MATERIAL_INSIDERS }}@github.com/squidfunk/mkdocs-material-insiders.git
           pip install git+https://${{ secrets.FASTAPI_MKDOCS_MATERIAL_INSIDERS }}@github.com/pawamoy-insiders/griffe-typing-deprecated.git