Update dependabot config

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

.github/dependabot.yml

@@ -6,11 +6,9 @@ updates:
     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"
+      interval: "monthly"