ci: add automerger for deps upgrades

Signed-off-by: Marvin <7430964+marpme@users.noreply.github.com>

Author: marpme

.github/workflows/depsmerge.yml

@@ -0,0 +1,16 @@
+name: auto-merge dependencies upgrades
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  auto-merge:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ahmadnassri/action-dependabot-auto-merge@v2
+        with:
+          target: minor
+          github-token: ${{ secrets.AUTO_MERGE_TOKEN }}