Build

prepare v1.12.0 + MSRV bump #197

Job	Run time
build_library_msrv	1m 43s
network_tests	30s
build_binary (macos-latest, 1.74.1)	4m 3s
style_checks	32s
build_binary (macos-latest, stable)	2m 31s
tests	29s
build_binary (macos-latest, nightly)	2m 47s
build_binary (ubuntu-latest, 1.74.1)	1m 23s
build_binary (ubuntu-latest, stable)	1m 31s
build_binary (ubuntu-latest, nightly)	1m 14s
build_binary (windows-latest, 1.74.1)	2m 4s
build_binary (windows-latest, stable)	2m 30s
build_binary (windows-latest, nightly)	2m 7s
	23m 24s

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