[CI] Update upmerge branches (#252)

Author: NoResponseMate

.github/workflows/upmerge_pr.yaml

@@ -20,18 +20,15 @@ jobs:
             fail-fast: false
             matrix:
                 include:
-                    -
-                        base_branch: "1.0"
-                        target_branch: "2.0"
-                    -
-                        base_branch: "2.0"
-                        target_branch: "2.1"
                     -
                         base_branch: "2.1"
                         target_branch: "2.2"
                     -
                         base_branch: "2.2"
                         target_branch: "3.0"
+                    -
+                        base_branch: "3.0"
+                        target_branch: "3.1"
 
         steps:
             -