workflows/release-binaries-all: Test PRs that modify build_llvm_release.bat (#208769)

Author: tstellar

.github/workflows/release-binaries-all.yml

@@ -53,6 +53,7 @@ on:
       - '.github/workflows/release-binaries-setup-stage/*'
       - '.github/workflows/release-binaries-save-stage/*'
       - 'clang/cmake/caches/Release.cmake'
+      - 'llvm/utils/release/build_llvm_release.bat'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || 'dispatch' }}