chore: try with intel mac

Author: not-matthias

.github/workflows/codspeed.yml

@@ -92,7 +92,7 @@ jobs:
             pnpm --workspace-concurrency 1 -r bench-vitest
 
   codspeed-walltime-macos:
-    runs-on: macos-26
+    runs-on: macos-26-intel
     steps:
       - uses: "actions/checkout@v4"
         with: