fix: default to LLVM 21.1.8 + support 22 #2695

Job	Run time
Build (ubuntu-22.04)	59s
Build-Executable-ubuntu-22.04-arm	43s
Build-Executable-ubuntu-22.04	51s
Build-Executable-macos-15-intel	2m 15s
Build-Executable-windows-2022	3m 48s
Test-ubuntu-22.04	18m 11s
Test-macos-15-intel	10m 2s
Test-ubuntu-24.04-arm	14m 57s
Test-windows-2022	10m 45s
Test-ubuntu-22.04-arm	15m 17s
Test-ubuntu-24.04	15m 30s
Test-macos-14	5m 14s
Test-macos-15	5m 44s
Docker-setup-cpp-ubuntu-linux/amd64-22.04	6m 3s
Build-Executable-macos-14	51s
Docker-setup-cpp-ubuntu-linux/amd64-20.04	5m 52s
Docker-setup-cpp-arch-linux/amd64-base	2m 41s
Docker-setup-cpp-ubuntu-linux/arm64-22.04	6m 50s
Docker-setup-cpp-alpine-linux/arm64-3.21	9m 27s
Docker-setup-cpp-ubuntu-linux/arm64-24.04	6m 49s
Docker-setup-cpp-ubuntu-linux/arm64-20.04	5m 54s
Docker-setup-cpp-alpine-linux/amd64-3.21	2m 32s
Docker-setup-cpp-fedora-linux/amd64-44	4m 5s
Docker-setup-cpp-ubuntu-linux/amd64-24.04	4m 54s
Docker-Manifest	-1s
Release	0s
	2h 40m 13s

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