fix dependabot file

Author: frantuma

.github/dependabot.yml

@@ -1,18 +1,9 @@
 version: 2
 updates:
   - package-ecosystem: "maven"
-    target-branch: "master"
     directory: "/"
     schedule:
       interval: "daily"
     ignore:
       - dependency-name: "*"
         update-types: ["version-update:semver-major"]
-  - package-ecosystem: "maven"
-    target-branch: "3.0.0"
-    directory: "/"
-    schedule:
-      interval: "daily"
-    ignore:
-      - dependency-name: "*"
-        update-types: ["version-update:semver-major"]