Tweak mergify.yml for 4.2.x

Author: michaelklishin

.github/mergify.yml

@@ -10,9 +10,6 @@ pull_request_rules:
     conditions:
       - base=main
       - label=backport-v4.2.x
-      - label!=backport-v4.1.x
-      - label!=backport-v4.0.x
-      - label!=backport-v3.13.x
     actions:
       backport:
         branches:
@@ -21,10 +18,8 @@ pull_request_rules:
           - "{{ author }}"
   - name: Automatically backport to v4.1.x based on label
     conditions:
-      - base=main
+      - base=v4.2.x
       - label=backport-v4.1.x
-      - label!=backport-v4.0.x
-      - label!=backport-v3.13.x
     actions:
       backport:
         branches: