fix: use mac runner for mac intel binary

Author: Ulises Himely

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
           files: target/aarch64-apple-darwin/release/aarch64-apple-darwin-site-monitor
   build_mac_intel:
     name: Mac Intel
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
     steps:
       - run: rustup target add x86_64-apple-darwin
       - uses: actions/checkout@v2