Modernize GitHub actions and declare MSRV #52

Job	Run time
Build and test for stable on ubuntu-latest	15s
Build and test for 1.84.1 on ubuntu-latest	18s
Build and test for 1.63 on ubuntu-latest	3m 42s
Build and test for nightly on ubuntu-latest	20s
Build and test for 1.63 on macos-latest	3m 27s
Build and test for 1.87 on ubuntu-latest	21s
Build and test for 1.87 on macos-latest	21s
Build and test for stable on macos-latest	19s
Build and test for nightly on macos-latest	26s
Build and test for 1.84.1 on macos-latest	23s
Build and test for 1.63 on windows-latest	5m 9s
Build and test for 1.84.1 on windows-latest	1m 8s
Build and test for stable on windows-latest	2m 1s
Build and test for nightly on windows-latest	45s
Build and test for 1.87 on windows-latest	43s
	19m 38s

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