dependabot: Fix time format to add leading 0 (#5822)

Author: joncinque

.github/dependabot.yml

@@ -4,7 +4,7 @@ updates:
   directory: "/"
   schedule:
     interval: daily
-    time: "9:00"
+    time: "09:00"
     timezone: UTC
   labels:
     - "automerge"