Remove dependabot config for 1.12.x branch

Author: shakuzen

Diff for: .github/dependabot.yml

@@ -22,23 +22,6 @@ updates:
 #          - version-update:semver-major
 #          - version-update:semver-minor
 #    open-pull-requests-limit: 30
-  - package-ecosystem: gradle
-    directory: "/"
-    schedule:
-      interval: monthly
-    target-branch: "1.12.x"
-    milestone: 211
-    ignore:
-      # metrics are better with https://github.com/Netflix/Hystrix/pull/1568 introduced
-      # in hystrix 1.5.12, but Netflix re-released 1.5.11 as 1.5.18 late in 2018.
-      # <=1.5.11 or 1.5.18 doesn't break with Micrometer, but open metrics won't be correct necessarily.
-      - dependency-name: "com.netflix.hystrix:hystrix-core"
-      # only upgrade patch versions
-      - dependency-name: "*"
-        update-types:
-          - version-update:semver-major
-          - version-update:semver-minor
-    open-pull-requests-limit: 30
   - package-ecosystem: gradle
     directory: "/"
     schedule: