ci: Add macos-26, and swap out macos-13

.github/workflows/ci-macvim.yaml

@@ -29,23 +29,20 @@ jobs:
             skip: ${{ ! startswith(github.ref, 'refs/tags/release') }}
             legacy: true
 
-          - os: macos-13
-            xcode: '15.2'
-            testgui: true
-            extra: [vimtags, check-xcodeproj-compat]
-
-          # Below runners use Apple Silicon.
           - os: macos-14
             xcode: '15.4'
-            testgui: false
+            testgui: true
+            extra: [vimtags, check-xcodeproj-compat]
 
-          # Most up to date OS and Xcode. Used to publish release for the main build.
           - os: macos-15
             xcode: '16.4'
-            testgui: true
+            testgui: false
             publish: true
             optimized: true
 
+          - os: macos-26
+            testgui: true
+
     uses: ./.github/workflows/macvim-buildtest.yaml
     with:
       skip: ${{ matrix.skip && true || false }}