Increase PHP 7.3 tests with Symfony 5.4

Author: alexander-schranz

.github/workflows/test-application.yaml

@@ -27,7 +27,7 @@ jobs:
                     - php-version: '7.3'
                       elasticsearch-version: '5.6.14'
                       lint: false
-                      symfony-version: '^4.4'
+                      symfony-version: '^5.4'
                       elasticsearch-package-constraint: '^5.0'
                       env: {}