Bump dependencies, edition, clean up Clippy reports #284

Job	Run time
Check eBPF conformance and code coverage	1m 52s
Build and test package (nightly, --no-default-features)	27s
Build and test package (beta, --all-features)	1m 9s
Build and test package (nightly, --all-features)	1m 12s
Build and test package (stable, --all-features)	1m 6s
	5m 46s

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