Pin icu_calendar to v2.1 (#704) #2180

Job	Run time
MSRV	24s
Test feature matrix	11m 52s
Test FFI (stable, ubuntu-latest)	1m 12s
Lint	3m 56s
Test (stable, macos-latest)	39s
Test (stable, ubuntu-latest)	41s
Test (stable, windows-latest)	2m 26s
Documentation	51s
	22m 1s

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