Update dependencies & bump MSRV #909

Job	Run time
Clippy (Nightly)	37s
Build+test (stable, ubuntu-latest)	1m 34s
Check for documentation errors	14s
Clippy	43s
Build+test (beta, ubuntu-latest)	1m 37s
Format	6s
Build+test (nightly, ubuntu-latest)	1m 44s
Check minimum versions of direct dependencies	13s
Build+test (macos-latest, stable)	1m 57s
msrv (ubuntu-latest)	1m 45s
Check semver compatibility	2m 22s
msrv (macos-latest)	1m 39s
msrv (windows-latest)	2m 23s
Build+test (windows-latest, stable)	4m 7s
	21m 1s

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