remove concurrency

.github/workflows/gradle.yml

@@ -25,10 +25,6 @@ on:
 permissions:
   contents: read
 
-concurrency:
-  group: build-${{ github.event_name }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: ${{ contains(fromJSON('["pull_request","pull_request_target"]'), github.event_name) }}
-
 jobs:
   build:
     if: >-