ci: disable non-security dependabot updates (#12487)

Signed-off-by: Anton Gilgur <agilgur5@gmail.com>

.github/dependabot.yml

@@ -6,10 +6,11 @@ updates:
       interval: "weekly"
       day: "saturday"
     ignore:
-    - dependency-name: k8s.io/*
-    - dependency-name: github.com/grpc-ecosystem/*
-    - dependency-name: google.golang.org/grpc
-    open-pull-requests-limit: 10
+      - dependency-name: k8s.io/*
+      - dependency-name: github.com/grpc-ecosystem/*
+      - dependency-name: google.golang.org/grpc
+    # ignore all non-security updates: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#open-pull-requests-limit
+    open-pull-requests-limit: 0
 
   - package-ecosystem: "github-actions"
     directory: "/"
@@ -20,6 +21,8 @@ updates:
       # temporarily ignore until https://github.com/actions/download-artifact/issues/249 is resolved
       - dependency-name: "actions/download-artifact"
       - dependency-name: "actions/upload-artifact"
+    # ignore all non-security updates: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#open-pull-requests-limit
+    open-pull-requests-limit: 0
 
   - package-ecosystem: "npm"
     directory: "/ui"
@@ -31,4 +34,5 @@ updates:
       - dependency-name: style-loader
       - dependency-name: react-router-dom
       - dependency-name: "@types/react-router-dom"
-    open-pull-requests-limit: 10
+    # ignore all non-security updates: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#open-pull-requests-limit
+    open-pull-requests-limit: 0