Bump version to 0.4.40 #3590

Job	Run time
features_check (ubuntu-latest)	3m 28s
rust_msrv (ubuntu-latest)	19s
rust_versions (ubuntu-latest, stable)	52s
timezones (ubuntu-latest, ACST-9:30)	1m 19s
rust_versions (ubuntu-latest, beta)	1m 0s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	12s
timezones (ubuntu-latest, EST4)	1m 16s
rust_versions (ubuntu-latest, nightly)	58s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	16s
timezones (ubuntu-latest, UTC0)	1m 13s
alternative_targets (ubuntu-latest, aarch64-linux-android)	15s
timezones (ubuntu-latest, Asia/Katmandu)	1m 10s
check-docs	22s
timezones (macos-latest, ACST-9:30)	48s
cross-targets (x86_64-unknown-illumos)	1m 5s
timezones (macos-latest, EST4)	48s
timezones (macos-latest, UTC0)	47s
cross-tests (ubuntu-latest)	1m 50s
timezones (macos-latest, Asia/Katmandu)	48s
no_std (ubuntu-latest, thumbv6m-none-eabi)	17s
timezones (windows-latest, ACST-9:30)	1m 43s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	21s
test_wasip1 (ubuntu-latest, wasm32-wasip1)	21s
timezones (windows-latest, EST4)	2m 5s
timezones (windows-latest, UTC0)	1m 33s
test_wasm (ubuntu-latest)	14s
timezones (windows-latest, Asia/Katmandu)	1m 43s
	27m 3s

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