chore: cleanup zoneinfo_rs crate (#674) #2124

Job	Run time
Test feature matrix	12m 9s
Lint	36s
Test FFI (stable, ubuntu-latest)	39s
Documentation	28s
Test (stable, windows-latest)	1m 33s
MSRV	24s
Test (stable, macos-latest)	36s
Test (stable, ubuntu-latest)	38s
	17m 3s

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