Remove workaround for Rust < 1.61 #2864

Job	Run time
rust_msrv (ubuntu-latest)	1m 5s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	25s
check-docs	21s
cross-targets (x86_64-sun-solaris)	1m 8s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	21s
alternative_targets (ubuntu-latest, aarch64-linux-android)	14s
cross-tests (ubuntu-latest)	2m 27s
features_check (ubuntu-latest)	5m 24s
features_check (macos-latest)	12m 18s
no_std (ubuntu-latest, thumbv6m-none-eabi)	9s
rust_versions (ubuntu-latest, stable)	1m 2s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	10s
features_check (windows-latest)	9m 52s
rust_versions (ubuntu-latest, beta)	1m 23s
rust_versions (ubuntu-latest, nightly)	1m 19s
test_wasi (ubuntu-latest, wasm32-wasi)	27s
test_wasm (ubuntu-latest)	23s
timezones (ubuntu-latest, ACST-9:30)	1m 22s
timezones (ubuntu-latest, EST4)	1m 17s
timezones (ubuntu-latest, UTC0)	1m 32s
timezones (ubuntu-latest, Asia/Katmandu)	1m 30s
timezones (macos-latest, ACST-9:30)	57s
timezones (macos-latest, EST4)	1m 40s
timezones (macos-latest, UTC0)	1m 5s
timezones (macos-latest, Asia/Katmandu)	1m 33s
timezones (windows-latest, ACST-9:30)	2m 6s
timezones (windows-latest, EST4)	2m 26s
timezones (windows-latest, UTC0)	2m 4s
timezones (windows-latest, Asia/Katmandu)	3m 15s
	59m 15s

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