Remove no longer needed regexManagers

Author: strangelookingnerd

.github/renovate.json

@@ -11,17 +11,5 @@
   "labels": [
     "dependencies"
   ],
-  "rebaseWhen": "conflicted",
-  "regexManagers": [
-    {
-      "fileMatch": [
-        ".mvn/extensions.xml"
-      ],
-      "matchStrings": [
-        "<version>(?<currentValue>.*?)<\/version>"
-      ],
-      "depNameTemplate": "io.jenkins.tools.incrementals:git-changelist-maven-extension",
-      "datasourceTemplate": "maven"
-    }
-  ]
-}
+  "rebaseWhen": "conflicted"
+}