Disable GHA updates in dependabot and reduce frequency in renovatebot (…

…#5746)

* Move GHA updates to be fully owned by renovate bot
* Reduce frequency to once a month
* Fix a bug that blocked major upgrades

---------

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Yuri Shkuro <github@ysh.us>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Yuri Shkuro <github@ysh.us>

.github/dependabot.yml

@@ -25,12 +25,6 @@ updates:
       interval: daily
     labels: [ "changelog:dependencies" ]
 
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    labels: [ "changelog:dependencies" ]
-
   - package-ecosystem: docker
     directories:
       - /cmd/agent

renovate.json

@@ -32,11 +32,12 @@
     },
     {
       "matchManagers": ["github-actions"],
-      "groupName": "github-actions deps"
+      "groupName": "github-actions deps",
+      "schedule": ["on the first day of the month"]
     },
     {
       "matchManagers": ["github-actions"],
-      "matchUpdateTypes": ["major", "patch", "digest"],
+      "matchUpdateTypes": ["patch", "digest"],
       "enabled": false
     },
     {