Retire rpi2 bb jetson #42

Job	Run time
build-github-hosted (ubuntu-latest, 16.x)	27s
build-github-hosted (ubuntu-latest, 18.x)	29s
build-github-hosted (ubuntu-latest, 20.x)	28s
build-github-hosted (windows-latest, 16.x)	2m 45s
build-github-hosted (windows-latest, 18.x)	2m 53s
build-github-hosted (windows-latest, 20.x)	4m 17s
build-github-hosted (macos-latest, 16.x)	29s
build-github-hosted (macos-latest, 18.x)	27s
build-github-hosted (macos-latest, 20.x)	24s
build-self-hosted (rpi3-32)	11m 11s
build-self-hosted (rpi3-64)	15m 52s
build-self-hosted (rpi4-32)	4m 48s
build-self-hosted (rpi4-64)	6m 5s
build-self-hosted (rpi5-64)	57s
	51m 32s

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