ci: bump playwright actions/cache usage to v4

.github/workflows/main.yml

@@ -344,7 +344,7 @@ jobs:
 
       - name: Cache Playwright Browsers for Playwright's Version
         id: cache-playwright-browsers
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/ms-playwright
           key: playwright-browsers-${{ env.PLAYWRIGHT_VERSION }}