[ci] Bump macOS runners to latest

The macos-12 runners were deprecated and removed [[1]].  Switch to the
latest, non-beta runner: macos-14.

[1]: actions/runner-images#10721

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

.github/workflows/unifiedBuildTestAndInstall.yml

@@ -10,8 +10,9 @@ on:
         options:
           - ubuntu-22.04
           - ubuntu-20.04
+          - macos-15
+          - macos-14
           - macos-13
-          - macos-12
           - windows-2022
           - windows-2019
       cmake_build_type:

.github/workflows/uploadReleaseArtifacts.yml

@@ -101,7 +101,7 @@ jobs:
         if: github.event_name == 'release' || ( github.event_name == 'workflow_dispatch' && inputs.os == 'macos' )
         env:
           os: macos
-          runner: macos-12
+          runner: macos-14
           arch: x64
           tar: gtar czf
           archive: tar.gz

.github/workflows/uploadWheels.yml

@@ -26,9 +26,9 @@ jobs:
             cibw_build: cp38-manylinux_x86_64
           - os: ubuntu-20.04
             cibw_build: cp310-manylinux_x86_64
-          - os: macos-12
+          - os: macos-14
             cibw_build: cp38-macosx_x86_64
-          - os: macos-12
+          - os: macos-14
             cibw_build: cp310-macosx_x86_64
 
     steps: