feat: Add macos (arm) 14+15 via depot runners

Author: baalimago

.github/workflows/test.yaml

@@ -544,7 +544,15 @@ jobs:
             },
             {
               build: macos-arm,
-              os: macos-14,
+              os: depot-macos-14,
+              target: aarch64-apple-darwin,
+              exe: "",
+              llvm_url: "https://github.com/wasmerio/llvm-custom-builds/releases/download/18.x/llvm-darwin-aarch64.tar.xz",
+              supports_v8: true,
+            },
+            {
+              build: macos-arm,
+              os: depot-macos-15,
               target: aarch64-apple-darwin,
               exe: "",
               llvm_url: "https://github.com/wasmerio/llvm-custom-builds/releases/download/21.x/llvm-darwin-aarch64.tar.xz",
@@ -580,6 +588,8 @@ jobs:
       SCCACHE_AZURE_CONNECTION_STRING: ${{ secrets.SCCACHE_AZURE_CONNECTION_STRING }}
     steps:
       - uses: actions/checkout@v6
+      - name: Set up Depot CLI
+        uses: depot/setup-action@v1
       - name: Set up libstdc++ on Linux
         if: matrix.metadata.build == 'linux-x64'
         run: |