update old self-hosted mac runner to native mac runner

Author: paulfitz

.github/workflows/ci.yml

@@ -35,8 +35,7 @@ jobs:
             node: 22
             host: x86
             target: x86
-          # This is a self-hosted runner, github doesn't have this architecture yet.
-          - os: macos-m1
+          - os: macos-latest
             node: 22
             host: arm64
             target: arm64
@@ -48,10 +47,6 @@ jobs:
           node-version: ${{ matrix.node }}
           architecture: ${{ matrix.host }}
 
-      - name: Add yarn (self-hosted)
-        if: matrix.os == 'macos-m1'
-        run: npm install -g yarn
-
       - name: Add msbuild to PATH
         uses: microsoft/setup-msbuild@v1.1
         if: contains(matrix.os, 'windows')