ci: group all GH action updates under the same PR

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

.github/dependabot.yml

@@ -4,6 +4,13 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     labels: ["area/ci", "dependencies"]
+    groups:
+      # Group all updates together, so that they are all applied in a single PR.
+      # Grouped updates are currently in beta and is subject to change.
+      # xref: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#groups
+      ci:
+        patterns:
+          - "*"
     schedule:
       # By default, this will be on a monday.
       interval: "weekly"