chore(deps): update actions/cache action to v6

.github/workflows/ci.yml

@@ -167,7 +167,7 @@ jobs:
       - name: Cache Playwright browsers
         if: '!env.ACT'
         id: playwright-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.cache/ms-playwright
           key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}