Do not update patch versions for dependabot/github-actions. (flutter#164055)

Towards flutter#158350.

Author: matanlurey

.github/dependabot.yml

@@ -17,6 +17,8 @@ updates:
       - "team"
       - "team-infra"
       - "autosubmit"
+    # Updating patch versions for "github-actions" is too chatty.
+    # See https://github.com/flutter/flutter/issues/158350.
     ignore:
-      - dependency-name: "codecov/codecov-action"
+      - dependency-name: "*"
         update-types: ["version-update:semver-patch"]