fix dependabot.yml

Author: rlindner81

.github/dependabot.yml

@@ -6,7 +6,7 @@ updates:
     directory: /
     schedule:
       interval: daily
-      time: 11:00
+      time: "11:00"
       timezone: Europe/Berlin
     allow:
       - dependency-type: production
@@ -15,7 +15,7 @@ updates:
     directory: /docs
     schedule:
       interval: daily
-      time: 11:00
+      time: "11:00"
       timezone: Europe/Berlin
     allow:
       - dependency-type: direct
@@ -24,5 +24,5 @@ updates:
     directory: /.github
     schedule:
       interval: daily
-      time: 11:00
+      time: "11:00"
       timezone: Europe/Berlin