Remove x86_64-apple-darwin target from release workflow

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: suma

.github/workflows/release.yml

@@ -29,9 +29,6 @@ jobs:
           - target: aarch64-apple-darwin
             runner: macos-latest
             os: macos
-          - target: x86_64-apple-darwin
-            runner: macos-13
-            os: macos
           - target: x86_64-pc-windows-msvc
             runner: windows-latest
             os: windows