fix: use macos-14 (ARM64) and macos-15-intel with deployment target 14.0

Configuration:
- macos-14: ARM64 runner with GSL 14.0
- macos-15-intel: Intel runner
- MACOSX_DEPLOYMENT_TARGET: 14.0 across all macOS runners

This avoids the GSL minimum target mismatch that occurred with
macos-15 ARM runners where GSL requires 15.0.

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

Co-Authored-By: Claude <[email protected]>

Author: corneliusroemer

.github/workflows/build_and_publish.yml

@@ -53,7 +53,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04, macos-15, macos-15-intel ]
+        os: [ ubuntu-24.04, macos-14, macos-15-intel ]
         python-version: [ 310, 311 ]
 
     steps:
@@ -69,10 +69,12 @@ jobs:
           config-file: cibuildwheel.toml
         env:
           CIBW_BUILD: "cp${{ matrix.python-version}}-*"
+          # Override deployment target to 14.0 for all macOS runners
+          MACOSX_DEPLOYMENT_TARGET: "14.0"
           # Skip cross-architecture testing to avoid brew/Rosetta issues
           CIBW_TEST_SKIP: >-
             ${{
-              matrix.os == 'macos-15' && '*macosx_x86_64* *aarch64* *ppc64* *s390x*' ||
+              matrix.os == 'macos-14' && '*macosx_x86_64* *aarch64* *ppc64* *s390x*' ||
               matrix.os == 'macos-15-intel' && '*macosx_arm64* *aarch64* *ppc64* *s390x*' ||
               '*aarch64* *arm64* *ppc64* *s390x*'
             }}

cibuildwheel.toml

@@ -13,7 +13,7 @@ skip = [
 
 macos.archs = ["x86_64", "arm64"]
 
-# GSL libraries from Homebrew require macOS 14.0 minimum for macOS 15 runners
+# GSL libraries from Homebrew require macOS 14.0 minimum
 macos.environment = {MACOSX_DEPLOYMENT_TARGET = "14.0"}
 
 build-verbosity = 1