Fix Sao Paulo bug in zoneinfo_rs #2109

Job	Run time
Lint	29s
Test FFI (stable, ubuntu-latest)	40s
Documentation	30s
MSRV	26s
Test (stable, ubuntu-latest)	24s
Test (stable, windows-latest)	6m 10s
Test feature matrix	11m 29s
Test (stable, macos-latest)	44s
	20m 52s

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