Update GitHub Actions to use macOS-14 (again).

See actions/runner-images#13046.

PiperOrigin-RevId: 836365578

Author: ericsalo

.github/workflows/test_upb.yml

@@ -169,14 +169,16 @@ jobs:
           # a single wheel. As a result we can just test the oldest and newest
           # supported Python versions and assume this gives us sufficient test
           # coverage.
-          - { os: ubuntu-latest, python-version: "3.8", architecture: x64, type: 'binary' }
-          - { os: macos-13, python-version: "3.8", architecture: x64, type: 'binary' }
-          - { os: ubuntu-latest, python-version: "3.11", architecture: x64, type: 'binary' }
-          - { os: macos-13, python-version: "3.11", architecture: x64, type: 'binary' }
-          - { os: ubuntu-latest, python-version: "3.8", architecture: x64, type: 'source' }
-          - { os: macos-13, python-version: "3.8", architecture: x64, type: 'source' }
-          - { os: ubuntu-latest, python-version: "3.11", architecture: x64, type: 'source' }
-          - { os: macos-13, python-version: "3.11", architecture: x64, type: 'source' }
+          - { os: ubuntu-latest, python-version: "3.9", architecture: x64, type: 'binary' }
+          - { os: macos-14, python-version: "3.9", architecture: arm64, type: 'binary' }
+          - { os: ubuntu-latest, python-version: "3.13", architecture: x64, type: 'binary' }
+          - { os: macos-14, python-version: "3.13", architecture: arm64, type: 'binary' }
+          - { os: ubuntu-latest, python-version: "3.9", architecture: x64, type: 'source'}
+          - { os: macos-14, python-version: "3.9", architecture: arm64, type: 'source', continuous-only: true }
+          - { os: ubuntu-latest, python-version: "3.13", architecture: x64, type: 'source'}
+          - { os: macos-14, python-version: "3.13", architecture: arm64, type: 'source', continuous-only: true }
+          - { os: ubuntu-latest, python-version: "3.14", architecture: x64, type: 'source', continuous-only: true }
+          - { os: macos-14, python-version: "3.14", architecture: arm64, type: 'source', continuous-only: true }
 
           # Windows uses the full API up until Python 3.10, so each of these
           # jobs tests a distinct binary wheel.