Cache update for github. Also confirmed LTS.

Author: Tornevall

.github/workflows/php.yml

@@ -25,7 +25,7 @@ jobs:
         run: composer validate
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: vendor
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}