Update Dependabot schedule time to 04:00

Changed the scheduled time for Dependabot updates from 06:00 to 04:00.

Now GitHub is removing @dependabot merge directives, I want this to finish before I look at
it in the mornings on the train.

Author: ascopes

.github/dependabot.yml

@@ -7,7 +7,7 @@ updates:
     schedule:
       interval: weekly
       day: monday
-      time: "06:00"
+      time: "04:00"
       timezone: Europe/London
     target-branch: main
     assignees:
@@ -22,7 +22,7 @@ updates:
     schedule:
       interval: weekly
       day: monday
-      time: "06:00"
+      time: "04:00"
       timezone: Europe/London
     open-pull-requests-limit: 999
     target-branch: main