Correct YAML syntax

Author: pcolby

.github/workflows/build.yaml

@@ -216,7 +216,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: brew --prefix llvm
-      - run:
+      - run: |
           find /usr/local/opt/llvm -name 'llvm-*'
           /usr/local/opt/llvm/llvm-profdata --version
       - run: |