fix cargo audit label

Author: sam0x17

.github/workflows/check-rust.yml

@@ -212,16 +212,7 @@ jobs:
   cargo-audit:
     name: cargo audit
     runs-on: SubtensorCI
-    strategy:
-      matrix:
-        rust-branch:
-          - stable
-        rust-target:
-          - x86_64-unknown-linux-gnu
-        # - x86_64-apple-darwin
-        os:
-          - ubuntu-latest
-          # - macos-latest
+    if: ${{ github.event_name == 'push' || (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'audit')) }}
     steps:
       - name: Check-out repositoroy under $GITHUB_WORKSPACE
         uses: actions/checkout@v4