add support for .NET 8 #239

Job	Run time
build-github-hosted (ubuntu-latest, 3.8)	33s
build-self-hosted (rpi3-32)	1m 2s
build-github-hosted (ubuntu-latest, 3.9)	38s
build-self-hosted (rpi3-64)	1m 13s
build-github-hosted (ubuntu-latest, 3.10)	40s
build-github-hosted (ubuntu-latest, 3.11)	59s
build-self-hosted (rpi4-32)	36s
build-github-hosted (ubuntu-latest, 3.12)	54s
build-self-hosted (rpi4-64)	38s
build-github-hosted (windows-latest, 3.8)	1m 21s
build-self-hosted (rpi5-64)	54s
build-github-hosted (windows-latest, 3.9)	1m 26s
build-github-hosted (windows-latest, 3.10)	1m 27s
build-github-hosted (windows-latest, 3.11)	1m 26s
build-github-hosted (windows-latest, 3.12)	1m 17s
build-github-hosted (macos-latest, 3.8)	1m 28s
build-github-hosted (macos-latest, 3.9)	56s
build-github-hosted (macos-latest, 3.10)	1m 4s
build-github-hosted (macos-latest, 3.11)	53s
build-github-hosted (macos-latest, 3.12)	1m 5s
	20m 30s

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