Update .mergify.yml (cosmos#361)

Author: Alex | Interchain Labs

.mergify.yml

@@ -12,39 +12,11 @@ queue_rules:
       {{ body }}
 
 pull_request_rules:
-  - name: backport patches to v6.0.x branch
+  - name: backport patches to v0.3.x branch
     conditions:
       - base=main
-      - label=backport/6.0.x
+      - label=backport/0.3.x
     actions:
       backport:
         branches:
-          - release/v6.0.x
-  - name: backport patches to v5.0.x branch
-    conditions:
-      - base=main
-      - label=backport/5.0.x
-    actions:
-      backport:
-        branches:
-          - release/v5.0.x
-  - name: backport patches to v4.0.x branch
-    conditions:
-      - base=main
-      - label=backport/4.0.x
-    actions:
-      backport:
-        branches:
-          - release/v4.0.x
-  - name: backport patches to v3.0.x branch
-    conditions:
-      - base=main
-      - label=backport/3.0.x
-    actions:
-      backport:
-        branches:
-          - release/v3.0.x
-  - name: refactored queue action rule
-    conditions: []
-    actions:
-      queue:
+          - release/v0.3.x