ci(#5658): add restore-keys for graceful cache fallback on version bumps

.github/workflows/tests.yml

@@ -126,6 +126,8 @@ jobs:
         with:
           path: ~/.cache/ms-playwright
           key: ${{ runner.os }}-playwright-${{ steps.pw-version.outputs.version }}
+          restore-keys: |
+            ${{ runner.os }}-playwright-
 
       - name: Install Playwright browsers
         run: python -m playwright install --with-deps chromium