Use c++23 in macos-15 GitHub Actions.

Lastique · Lastique · commit b74b5534821e · 2025-12-13T20:42:38.000+03:00
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -297,7 +297,7 @@ jobs:
             cxxstd: "11,14,17,20,2b"
             os: macos-14
           - toolset: clang
-            cxxstd: "11,14,17,20,2b"
+            cxxstd: "11,14,17,20,23"
             os: macos-15
 
           - name: CMake tests
