ci(release): remove x86_64-apple-darwin build target

Drop Intel Mac (macos-13) from the release matrix,
keep only aarch64-apple-darwin (Apple Silicon).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: invalid

.github/workflows/release.yml

@@ -23,9 +23,6 @@ jobs:
             os: ubuntu-22.04
             artifact: codegraph-aarch64-linux
             use_cross: true
-          - target: x86_64-apple-darwin
-            os: macos-13
-            artifact: codegraph-x86_64-macos
           - target: aarch64-apple-darwin
             os: macos-14
             artifact: codegraph-aarch64-macos