Update build_develop.yml (#22996)

.github/workflows/build_develop.yml

@@ -6,6 +6,9 @@ on:
     branches: [ develop ]
   repository_dispatch:
     types: [ element-web-notify ]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.workflow_run.head_branch }}
+  cancel-in-progress: true
 jobs:
   build:
     name: "Build & Upload source maps to Sentry"