Enable dependabot for the 2.1 branch.

Signed-off-by: James R. Perkins <[email protected]>

.github/dependabot.yml

@@ -16,3 +16,20 @@ updates:
  directory: "/"
  schedule:
  interval: "daily"
+# 2.1 branch
+ - package-ecosystem: "maven"
+ directory: "/"
+ target-branch: "2.1"
+ schedule:
+ interval: "daily"
+ ignore:
+ - dependency-name: '*'
+ update-types: ['version-update:semver-major', 'version-update:semver-minor']
+ open-pull-requests-limit: 10
+ - package-ecosystem: "github-actions"
+ # Workflow files stored in the
+ # default location of `.github/workflows`
+ directory: "/"
+ target-branch: "2.1"
+ schedule:
+ interval: "daily"