Pin Swift macOS PR checks to macOS 15 for Xcode 16 #12603

Job	Run time
analyze-other (actions)	41s
analyze-other (python)	54s
check-codeql-versions	11s
analyze-javascript (ubuntu-24.04, linked)	4m 43s
analyze-javascript (ubuntu-22.04)	4m 29s
analyze-javascript (windows-2025, linked)	6m 32s
analyze-javascript (macos-14-xlarge)	2m 50s
analyze-javascript (windows-2022)	5m 59s
analyze-javascript (ubuntu-22.04, linked)	4m 42s
analyze-javascript (macos-14-xlarge, linked)	2m 38s
analyze-javascript (macos-15-xlarge)	2m 30s
analyze-javascript (windows-2022, linked)	6m 15s
analyze-javascript (windows-2025)	5m 58s
analyze-javascript (macos-15-xlarge, linked)	2m 28s
analyze-javascript (ubuntu-24.04)	4m 35s
	55m 25s

Provide feedback