bumping test workflow macos-13 to macos-14

Author: andrewkern

.github/workflows/tests.yml

@@ -23,8 +23,8 @@ jobs:
           - { os: ubuntu-22.04, gcc: 9, python: 3.9 }
           - { os: ubuntu-24.04, gcc: 12, python: 3.12 }
           # macOS, oldest supported version
-          # (macos-10.15, macos-11, and macos-12 were removed by GitHub)
-          - { os: macos-13, python: 3.9 }
+          # (macos-10.15, macos-11, macos-12, and macos-13 were removed by GitHub)
+          - { os: macos-14, python: 3.9 }
           # macOS, newest supported version
           - { os: macos-15, python: 3.12 }
 
@@ -197,11 +197,11 @@ jobs:
           - { os: ubuntu-22.04, qt: 5.15.2, gcc: 12 }
           # Ubuntu 24.04 with the most recent Qt6 and GCC.
           - { os: ubuntu-22.04, qt: 6.8.2, gcc: 12 }
-          # old macOS with oldest supported Qt5; macos-12 was removed by GitHub,
+          # old macOS with oldest supported Qt5; macos-12 and macos-13 were removed by GitHub,
           # so we can't CI with Qt 5.9.5 any more, oh well
           #- {os: macos-12, qt: 5.9.5}
           # old macOS with last official LTS Qt5
-          - { os: macos-13, qt: 5.15.2 }
+          - { os: macos-14, qt: 5.15.2 }
           # new macOS with most recent Qt6
           - { os: macos-15, qt: 6.8.2 }
     runs-on: ${{ matrix.os }}