Ignore dependabot updates for k8s.io patches

We typically don't create patch releases for k8s updates, so they just
create a lot of churn in the commit history and changelog.

Users are free to specify any patch version greater than the minimum
defined here.

Signed-off-by: Scott Andrews <andrewssc@vmware.com>

.github/dependabot.yml

@@ -11,6 +11,10 @@ updates:
   directory: "/"
   schedule:
     interval: daily
+  ignore:
+  - dependency-name: k8s.io/*
+    update-types:
+    - version-update:semver-patch
   open-pull-requests-limit: 10
   reviewers:
   - scothis