MSRV bump and macOS build warnings fix #168

Job	Run time
Clippy Linting	14s
Test Suite (1.63.0, windows-latest)	5m 55s
Test Suite (1.63.0, macos-latest)	6m 5s
Test Suite (stable, windows-latest)	58s
Test Suite (stable, ubuntu-latest)	24s
Test Suite (stable, macos-latest)	29s
Test Suite (1.63.0, ubuntu-latest)	5m 47s
	19m 52s

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