CI: Use macos-14 for GMT Dev Tests workflow (#3024)

CI: Use macos-13 for GMT Dev Tests workflow

Xref https://github.blog/changelog/2024-01-30-github-actions-macos-14-sonoma-is-now-available

Author: weiji14

.github/workflows/ci_tests_dev.yaml

@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, macos-13, windows-2022]
+        os: [ubuntu-22.04, macos-14, windows-2022]
         gmt_git_ref: [master]
     timeout-minutes: 30
     defaults: