dependabot interval for gha monthly

.github/dependabot.yml

@@ -1,14 +1,17 @@
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
 version: 2
 updates:
- - package-ecosystem: "devcontainers"
-   directory: "/"
-   schedule:
-     interval: weekly
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "daily"
-  - package-ecosystem: "pip"
+      interval: "monthly"
+    groups:
+       # Name for the group, which will be used in PR titles and branch names
+       all-github-actions:
+          # Group all updates together
+          patterns:
+            - "*"
+  - package-ecosystem: "devcontainers"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "monthly"