chore: update mergify and db access diagram

Author: abhisheksr01

.github/mergify.yml

@@ -0,0 +1,19 @@
+pull_request_rules:
+  - name: "Automatic merge when CI passes"
+    conditions:
+      - "status-success=dependency-vulnerability-analysis-pr"
+      - "status-success=bdd-test-pr"
+      - base=main
+      - author=dependabot[bot]
+    actions:
+      merge:
+        method: merge
+
+queue_rules:
+  - name: dep-update
+    batch_size: 10
+    batch_max_wait_time: 30 min
+    queue_conditions:
+      - author=dependabot[bot]
+      - "status-success=dependency-vulnerability-analysis-pr"
+      - "status-success=bdd-test-pr"