ci: fix typo

.github/workflows/run_test_cases.yaml

@@ -44,7 +44,7 @@ jobs:
 
     permissions:
       contents: read
-      pull_requests: write
+      pull-requests: write
 
     steps:
       - uses: actions/download-artifact@c850b930e6ba138125429b7e5c93fc707a7f8427 # v4.1.4
@@ -83,7 +83,7 @@ jobs:
 
     permissions:
       contents: read
-      pull_requests: write
+      pull-requests: write
 
     env:
       DOCKER_CT_RUNNER_IMAGE: "ghcr.io/emqx/emqx-builder/${{ matrix.builder }}:${{ matrix.elixir }}-${{ matrix.otp }}-ubuntu22.04"
@@ -155,7 +155,7 @@ jobs:
 
     permissions:
       contents: read
-      pull_requests: write
+      pull-requests: write
 
     env:
       PROFILE: ${{ matrix.profile }}