chore: add dependabot config with daily schedule and automerge

Author: trejjam

.github/dependabot.yml

@@ -0,0 +1,20 @@
+version: 2
+updates:
+  - package-ecosystem: "composer"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    versioning-strategy: "increase"
+    reviewers:
+      - "trejjam"
+    labels:
+      - "automerge"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    reviewers:
+      - "trejjam"
+    labels:
+      - "automerge"