Disable automatic self updates in CI environments #1125

Job	Run time
build-freebsd-stable	0s
build-freebsd-master	0s
build-all-features (ubuntu-latest, x86_64-unknown-linux-gnu)	5m 4s
build-linux-master	0s
build-all-features (windows-latest, x86_64-pc-windows-msvc)	9m 28s
build-linux-pr (dev, x86_64-unknown-linux-gnu)	7m 8s
build-linux-stable	0s
build-linux-pr (dev, armv7-unknown-linux-gnueabihf)	56s
build-macos-aarch64 (dev, aarch64-apple-darwin)	10m 56s
build-macos-x86_64 (dev, x86_64-apple-darwin)	11m 58s
build-linux-pr (dev, aarch64-linux-android)	1m 8s
build-macos-aarch64 (release, aarch64-apple-darwin)	1m 38s
build-macos-x86_64 (release, x86_64-apple-darwin)	3m 24s
build-linux-pr (release, x86_64-unknown-linux-gnu)	2m 28s
build-windows-master	0s
build-linux-pr (release, armv7-unknown-linux-gnueabihf)	1m 59s
build-windows-pr (dev, x86_64-pc-windows-msvc)	21m 47s
build-linux-pr (release, aarch64-linux-android)	2m 8s
build-windows-stable	0s
build-windows-pr (dev, aarch64-pc-windows-msvc)	2m 22s
check	51s
build-windows-pr (dev, x86_64-pc-windows-gnu)	4m 15s
doc	7s
build-windows-pr (release, x86_64-pc-windows-msvc)	4m 31s
build-windows-pr (release, aarch64-pc-windows-msvc)	5m 27s
build-windows-pr (release, x86_64-pc-windows-gnu)	4m 44s
conclusion	1s
	1h 42m 20s

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