benches: add feature unstable-locales #3461

Job	Run time
cross-targets (x86_64-unknown-illumos)	1m 6s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	23s
features_check (ubuntu-latest)	4m 25s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	39s
no_std (ubuntu-latest, thumbv6m-none-eabi)	10s
alternative_targets (ubuntu-latest, aarch64-linux-android)	12s
rust_msrv (ubuntu-latest)	3m 2s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	13s
rust_versions (ubuntu-latest, stable)	1m 15s
test_wasi (ubuntu-latest, wasm32-wasi)	29s
test_wasm (ubuntu-latest)	31s
rust_versions (ubuntu-latest, beta)	1m 15s
timezones (ubuntu-latest, ACST-9:30)	1m 29s
rust_versions (ubuntu-latest, nightly)	1m 15s
timezones (ubuntu-latest, EST4)	1m 51s
timezones (ubuntu-latest, UTC0)	1m 26s
check-docs	21s
timezones (ubuntu-latest, Asia/Katmandu)	1m 35s
cross-tests (ubuntu-latest)	3m 12s
timezones (macos-latest, ACST-9:30)	43s
timezones (macos-latest, EST4)	41s
timezones (macos-latest, UTC0)	51s
timezones (macos-latest, Asia/Katmandu)	44s
timezones (windows-latest, ACST-9:30)	2m 29s
timezones (windows-latest, EST4)	2m 36s
timezones (windows-latest, UTC0)	2m 36s
timezones (windows-latest, Asia/Katmandu)	3m 20s
	38m 49s

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