fix(renovate): try fileMatch with simpler pattern

renovate.json

@@ -131,8 +131,8 @@
     {
       "customType": "regex",
       "description": "Update Docker images in Jinja2 compose templates",
-      "managerFilePatterns": [
-        "/(^|/)library/compose/.+/compose\\.(yaml|yml)\\.j2$/"
+      "fileMatch": [
+        "(^|/)\.j2$"
       ],
       "matchStrings": [
         "image:\\s*(?<depName>[^:\\s]+):(?<currentValue>[^\\s\\n{]+)"