Merge pull request #68 from CESNET/renovate/actions-cache-3.x

chore(deps): update actions/cache action to v3

Author: Dominik František Bučík

.github/workflows/build_and_check.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Cache Composer dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: /tmp/composer-cache
           key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}