Explore using icu4 #2325

Job	Run time
rust_msrv (ubuntu-latest)	54s
rust_versions (ubuntu-latest, stable)	3m 44s
rust_versions (ubuntu-latest, beta)	4m 11s
rust_versions (ubuntu-latest, nightly)	4m 19s
timezones_linux (ubuntu-latest, ACST-9:30)	4m 23s
timezones_linux (ubuntu-latest, EST4)	4m 57s
timezones_linux (ubuntu-latest, UTC0)	4m 18s
timezones_linux (ubuntu-latest, Asia/Katmandu)	5m 19s
timezones_other (macos-latest, ACST-9:30)	2m 56s
timezones_other (macos-latest, EST4)	3m 19s
timezones_other (macos-latest, UTC0)	3m 31s
timezones_other (macos-latest, Asia/Katmandu)	3m 5s
timezones_other (windows-latest, ACST-9:30)	4m 14s
timezones_other (windows-latest, EST4)	5m 34s
timezones_other (windows-latest, UTC0)	5m 37s
timezones_other (windows-latest, Asia/Katmandu)	4m 50s
alternative_targets (ubuntu-latest, wasm32-wasi)	26s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	43s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	34s
alternative_targets (ubuntu-latest, aarch64-linux-android)	30s
check-docs	3m 23s
cross-targets (x86_64-sun-solaris)	1m 48s
features_check (ubuntu-latest)	1h 7m 48s
features_check (macos-latest)	1h 9m 14s
features_check (windows-latest)	1h 27m 23s
no_std (ubuntu-latest, thumbv6m-none-eabi)	30s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	28s
test_wasm (ubuntu-latest)	34s
	4h 58m 32s

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