Update pull.yml for 5.5. release branch

Author: kateinoigakukun

.github/pull.yml

@@ -21,4 +21,11 @@ rules:
     upstream: release/5.4
     mergeMethod: merge
 
+  - base: release/5.5
+    upstream: apple:release/5.5
+    mergeMethod: hardreset
+  - base: swiftwasm-release/5.5
+    upstream: release/5.5
+    mergeMethod: merge
+
 label: ":arrow_heading_down: Upstream Tracking"