Add Dependabot config

Configure Dependabot to monitor Swift Package Manager and GitHub Actions
weekly with PR limits

Author: ivan-magda

.github/dependabot.yml

@@ -0,0 +1,15 @@
+version: 2
+updates:
+  # Swift Package Manager dependencies
+  - package-ecosystem: "swift"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10