Bump MSRV to 1.61 #2753

Job	Run time
rust_msrv (ubuntu-latest)	7m 47s
timezones (ubuntu-latest, ACST-9:30)	1m 31s
timezones (ubuntu-latest, EST4)	1m 28s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	26s
features_check (ubuntu-latest)	5m 0s
timezones (ubuntu-latest, UTC0)	1m 33s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	29s
features_check (macos-latest)	14m 24s
timezones (ubuntu-latest, Asia/Katmandu)	1m 30s
alternative_targets (ubuntu-latest, aarch64-linux-android)	14s
features_check (windows-latest)	13m 23s
timezones (macos-latest, ACST-9:30)	1m 45s
timezones (macos-latest, EST4)	1m 21s
no_std (ubuntu-latest, thumbv6m-none-eabi)	25s
rust_versions (ubuntu-latest, stable)	1m 27s
timezones (macos-latest, UTC0)	1m 17s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	26s
rust_versions (ubuntu-latest, beta)	2m 14s
timezones (macos-latest, Asia/Katmandu)	1m 24s
rust_versions (ubuntu-latest, nightly)	2m 9s
timezones (windows-latest, ACST-9:30)	2m 25s
test_wasi (ubuntu-latest, wasm32-wasi)	44s
timezones (windows-latest, EST4)	1m 41s
timezones (windows-latest, UTC0)	3m 10s
test_wasm (ubuntu-latest)	37s
timezones (windows-latest, Asia/Katmandu)	1m 57s
check-docs	40s
cross-targets (x86_64-sun-solaris)	1m 9s
cross-tests (ubuntu-latest)	3m 15s
	1h 15m 51s

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