fix(ci): use correct 6vCPU Blacksmith macOS runner instance type

Author: cursoragent

.github/workflows/release.yml

@@ -141,7 +141,7 @@ jobs:
       matrix:
         include:
           - label: macOS arm64
-            runner: blacksmith-12vcpu-macos-26
+            runner: blacksmith-6vcpu-macos-26
             platform: mac
             target: dmg
             arch: arm64