update actions workflow

Author: acalejos

.github/workflows/precompile.yml

@@ -52,7 +52,7 @@ jobs:
       MIX_ENV: "prod"
     strategy:
       matrix:
-        runner: ["macos-latest", exgboost-m2-runner]
+        runner: ["macos-latest", "exgboost-m2-runner"]
         otp: ["25.0", "26.0"]
         elixir: ["1.14.5"]
     steps: