fix: remove retired macos-13 runner from publish workflow

macOS-13 runners are now retired. Using macos-14 (ARM64) for macOS
wheel builds. Intel Mac users can install from source distribution.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: djfrancesco

.github/workflows/publish.yml

@@ -48,7 +48,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-2022, macos-13, macos-14]
+        os: [ubuntu-latest, windows-2022, macos-14]
 
     steps:
       - uses: actions/checkout@v4