Updating phpunit-mysql.yml workflow from template

Signed-off-by: Nextcloud bot <bot@nextcloud.com>

Author: nextcloud-bot

.github/workflows/phpunit-mysql.yml

@@ -71,7 +71,7 @@ jobs:
           - 4444:3306/tcp
         env:
           MYSQL_ROOT_PASSWORD: rootpassword
-        options: --health-cmd="mysqladmin ping" --health-interval 5s --health-timeout 2s --health-retries 5
+        options: --health-cmd="mysqladmin ping" --health-interval 5s --health-timeout 2s --health-retries 10
 
     steps:
       - name: Set app env
@@ -109,7 +109,7 @@ jobs:
 
       - name: Check composer file existence
         id: check_composer
-        uses: andstor/file-existence-action@076e0072799f4942c8bc574a82233e1e4d13e9d6 # v2
+        uses: andstor/file-existence-action@076e0072799f4942c8bc574a82233e1e4d13e9d6 # v3.0.0
         with:
           files: apps/${{ env.APP_NAME }}/composer.json