Upgrade to GitHub-native Dependabot

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: composer
+ directory: "/"
+ schedule:
+ interval: daily
+ time: "21:00"
+ open-pull-requests-limit: 10