ci: Test on macos-13 (x86-64) instead of 14 (ARM)

macos-15 is also ARM, so no need to test it two time

Author: jorisv

.github/workflows/ci-linux-osx-win-conda.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         build_type: [Release, Debug]
-        name: [ubuntu-latest, macos-latest, windows-latest-clang-cl, windows-latest, macos-14]
+        name: [ubuntu-latest, macos-latest, windows-latest-clang-cl, windows-latest, macos-13]
         cxx_std: [17, 20]
         continue_on_error: [false]