🌱 configure dependabot to group (most) GitHub actions weekly (#3655)

actions which influence the build/release process are excluded.
dependabot will send individual updates for those.

Signed-off-by: Spencer Schrock <sschrock@google.com>

.github/dependabot.yml

@@ -19,10 +19,19 @@ updates:
 - package-ecosystem: "github-actions"
   directory: "/"
   schedule:
-      interval: "daily"
+      interval: "weekly"
   rebase-strategy: disabled
   commit-message:
       prefix: ":seedling:"
+  groups:
+    github-actions:
+      patterns:
+        - "*"
+      # These actions directly influence the build process and are excluded from grouped updates
+      exclude-patterns:
+        - "actions/setup-go"
+        - "arduino/setup-protoc"
+        - "goreleaser/goreleaser-action"
 - package-ecosystem: docker
   directory: "/"
   schedule: