fix(renovate): use fileMatch instead of managerFilePatterns for .j2 files

renovate.json

@@ -130,8 +130,8 @@
     {
       "customType": "regex",
       "description": "Update Docker images in Jinja2 compose templates",
-      "managerFilePatterns": [
-        "/library/compose/.+/compose\\.ya?ml\\.j2$/"
+      "fileMatch": [
+        "(^|/)library/compose/.+/compose\\.ya?ml\\.j2$"
       ],
       "matchStrings": [
         "image:\\s*(?<depName>[^:\\s]+):(?<currentValue>[^\\s\\n{]+)"