security version only for github actions (#1707)

Signed-off-by: Ceyhun Onur <ceyhun.onur@avalabs.org>

Author: ceyonur

.github/dependabot.yml

@@ -14,6 +14,7 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    open-pull-requests-limit: 0 # Disable non-security version updates
     ignore:
       - dependency-name: "ava-labs/avalanchego/.github/actions/run-monitored-tmpnet-cmd" # manually updated
       - dependency-name: "golangci/golangci-lint-action"