chore(dependabot): fix invalid timezone

Author: fredbi

.github/dependabot.yaml

@@ -31,7 +31,7 @@ updates:
     schedule:
       interval: "cron"
       cronjob: "35 7 * * 3,6"    # => update twice a week
-      timezone: CEST
+      timezone: CET
     open-pull-requests-limit: 4
     groups:
       development-dependencies: