feat: add test case for shopware 6.5.5 (#108)

Author: tinect

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ "v6.5.0", "v6.5.1", "v6.5.2", "v6.5.3", "v6.5.4", "trunk" ]
+        version: [ "v6.5.0", "v6.5.1", "v6.5.2", "v6.5.3", "v6.5.4", "v6.5.5", "trunk" ]
     container: ghcr.io/friendsofshopware/platform-plugin-dev:${{ matrix.version }}
     runs-on: ubuntu-latest
     steps: