[DOWNSTREAM-ONLY] ci: disable Dependabot PR creation

Depandabot automatic updating for GitHub Actions is not wanted. Changes
should flow in from the upstream repository instead.

Closes: #82
See-also: 945da36
Signed-off-by: Niels de Vos <ndevos@redhat.com>

.github/dependabot.yml

@@ -13,6 +13,8 @@ updates:
     labels:
       - vendor
   - package-ecosystem: "gomod"
+    # ODF only: disable PR creation, synced from upstream
+    open-pull-requests-limit: 0
     directory: "/tools"
     schedule:
       interval: "weekly"