Update Dependabot configuration (OpenAPITools#161)

https://github.blog/2020-06-01-keep-all-your-packages-up-to-date-with-dependabot/

Co-authored-by: Jochen Schalanda <[email protected]>

Author: sullis

.github/dependabot.yml

@@ -1,8 +1,10 @@
 version: 2
 updates:
-- package-ecosystem: maven
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "04:00"
-  open-pull-requests-limit: 10
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"