blast_repo fixes (dart-archive/source_span#98)

dependabot

Author: devoncarew

pkgs/source_span/.github/dependabot.yml

@@ -4,7 +4,9 @@
 version: 2
 updates:
 
-- package-ecosystem: "github-actions"
-  directory: "/"
+- package-ecosystem: github-actions
+  directory: /
   schedule:
-    interval: "monthly"
+    interval: monthly
+  labels:
+    - autosubmit