separate controller-runtime in dependabot config

Controller-Runtime, based on history in the Rook project [1], makes
breaking API changes more often than other k8s projects. Separating
these updates from the other k8s updates will help keep most dependabot
PRs merge-able.

[1] github.com/rook/rook

Signed-off-by: Blaine Gardner <blaine.gardner@ibm.com>

Author: BlaineEXE

.github/dependabot.yml

@@ -14,6 +14,9 @@ updates:
         patterns:
           - "k8s.io*"
           - "sigs.k8s.io*"
+        exclude-patterns:
+          # controller-runtime has history of breaking API changes more often than other k8s projects
+          - "sigs.k8s.io/controller-runtime"
       github-dependencies:
         patterns:
           - "github.com*"