Run on Xcode 26

Author: jberkel

.github/workflows/build.yml

@@ -14,7 +14,10 @@ env:
   IOS_VERSION: "18.4"
 jobs:
   build:
-    runs-on: macos-15
+    strategy:
+      matrix:
+        os: [macos-15, macos-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
     - name: "Lint"