bump github actions versions (#4535)

Author: grossmannmartin

.github/workflows/build-phar.yaml

@@ -21,7 +21,7 @@ jobs:
             contents: write
         steps:
             -   name: Checkout code
-                uses: actions/checkout@v4
+                uses: actions/checkout@v6
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2