chore: add mergify

.mergify

@@ -0,0 +1,17 @@
+pull_request_rules:
+  - name: Automatically merge Dependabot PRs
+    conditions:
+      - base=master
+      - author=dependabot[bot]
+      - label=dependencies
+      - -title~=(WIP|wip)
+      - -label~=(blocked|do-not-merge)
+      - -merged
+      - -closed
+    actions:
+      review:
+        type: APPROVE
+      merge:
+        method: squash
+        strict: smart+fasttrack
+        strict_method: merge