chore: add Dependabot configuration (#372)

Co-authored-by: gitikavj <gitikavj@amazon.com>

Author: notgitika

.github/dependabot.yml

@@ -0,0 +1,26 @@
+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    groups:
+      dev-dependencies:
+        dependency-type: 'development'
+        patterns:
+          - '@types/*'
+          - 'eslint*'
+          - 'prettier*'
+          - 'vitest*'
+          - '@trivago/*'
+    commit-message:
+      prefix: 'chore'
+      include: 'scope'
+    open-pull-requests-limit: 20
+
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    commit-message:
+      prefix: 'ci'