Benchmark on macOS 15 to catch potential performance impacts of new features.

Author: christiangnrd

.buildkite/pipeline.yml

@@ -142,9 +142,10 @@ steps:
         artifact_paths:
           - "benchmarkresults.json"
         agents:
-          queue: "juliaecosystem"
+          queue: "julia"
           os: "macos"
           arch: "aarch64"
+          macos_version: "15.0"
         if: |
           build.message =~ /\[only benchmarks\]/ ||
           build.message !~ /\[only/ && !build.pull_request.draft &&