Upgrade runner from macos-12 to macos-13

The macos-12 (Intel) Github Actions runner is no longer supported.  Upgrading to the macos-13 runner.

Author: keitherskine

.github/workflows/artifacts_build.yml

@@ -87,8 +87,8 @@ jobs:
 
   build_macos_x86_wheels:
     name: Build wheels on macOS x86_64
-    # macos-12 is an Intel x86 runner
-    runs-on: macos-12
+    # macos-13 is an Intel x86 runner
+    runs-on: macos-13
 
     steps:
       - uses: actions/checkout@v4.1.1