Update python minimum version to 3.9 #263

Job	Run time
build-github-hosted (ubuntu-latest, 3.9)	7s
build-github-hosted (ubuntu-latest, 3.10)	7s
build-github-hosted (ubuntu-latest, 3.11)	6s
build-self-hosted (rpi3-32)	27s
build-github-hosted (ubuntu-latest, 3.12)	5s
build-self-hosted (rpi3-64)	26s
build-github-hosted (ubuntu-latest, 3.13)	9s
build-self-hosted (rpi4-32)	16s
build-github-hosted (windows-latest, 3.9)	28s
build-self-hosted (rpi4-64)	14s
build-github-hosted (windows-latest, 3.10)	26s
build-self-hosted (rpi5-64)	8s
build-github-hosted (windows-latest, 3.11)	31s
build-self-hosted (pv-windows-arm64)	19s
build-github-hosted (windows-latest, 3.12)	53s
build-github-hosted (windows-latest, 3.13)	30s
build-github-hosted (macos-latest, 3.9)	28s
build-github-hosted (macos-latest, 3.10)	28s
build-github-hosted (macos-latest, 3.11)	10s
build-github-hosted (macos-latest, 3.12)	10s
build-github-hosted (macos-latest, 3.13)	10s
	6m 38s

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