Add Dependabot configuration file

A new configuration file for Dependabot has been created, scheduling weekly updates for GitHub Actions and daily updates for Gradle. This setup will automatically check for updates and help to keep our dependencies up-to-date.

.github/dependabot.yml

@@ -0,0 +1,17 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "00:00"
+    groups:
+      all-actions:
+        patterns: [ "*" ]
+
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "00:00"