Silence clippy lint for test code #2769

Job	Run time
rust_versions (ubuntu-latest, stable)	1m 21s
features_check (ubuntu-latest)	5m 56s
rust_versions (ubuntu-latest, beta)	1m 7s
features_check (macos-latest)	11m 22s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	26s
rust_versions (ubuntu-latest, nightly)	1m 18s
features_check (windows-latest)	9m 35s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	16s
alternative_targets (ubuntu-latest, aarch64-linux-android)	20s
check-docs	22s
cross-targets (x86_64-sun-solaris)	1m 11s
cross-tests (ubuntu-latest)	1m 49s
no_std (ubuntu-latest, thumbv6m-none-eabi)	18s
rust_msrv (ubuntu-latest)	1m 0s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	21s
test_wasi (ubuntu-latest, wasm32-wasi)	28s
test_wasm (ubuntu-latest)	22s
timezones (ubuntu-latest, ACST-9:30)	1m 30s
timezones (ubuntu-latest, EST4)	1m 23s
timezones (ubuntu-latest, UTC0)	1m 28s
timezones (ubuntu-latest, Asia/Katmandu)	1m 25s
timezones (macos-latest, ACST-9:30)	1m 35s
timezones (macos-latest, EST4)	1m 17s
timezones (macos-latest, UTC0)	50s
timezones (macos-latest, Asia/Katmandu)	1m 25s
timezones (windows-latest, ACST-9:30)	1m 44s
timezones (windows-latest, EST4)	1m 44s
timezones (windows-latest, UTC0)	1m 36s
timezones (windows-latest, Asia/Katmandu)	1m 42s
	55m 11s

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