Bump version to 0.4.39 #3512

Job	Run time
cross-targets (x86_64-unknown-illumos)	1m 1s
cross-tests (ubuntu-latest)	1m 39s
check-docs	21s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	18s
features_check (ubuntu-latest)	3m 55s
rust_msrv (ubuntu-latest)	1m 3s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	13s
no_std (ubuntu-latest, thumbv6m-none-eabi)	16s
alternative_targets (ubuntu-latest, aarch64-linux-android)	17s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	20s
rust_versions (ubuntu-latest, stable)	1m 13s
test_wasi (ubuntu-latest, wasm32-wasi)	34s
rust_versions (ubuntu-latest, beta)	1m 17s
test_wasm (ubuntu-latest)	38s
timezones (ubuntu-latest, ACST-9:30)	1m 27s
rust_versions (ubuntu-latest, nightly)	1m 37s
timezones (ubuntu-latest, EST4)	1m 25s
timezones (ubuntu-latest, UTC0)	1m 32s
timezones (ubuntu-latest, Asia/Katmandu)	1m 58s
timezones (macos-latest, ACST-9:30)	55s
timezones (macos-latest, EST4)	52s
timezones (macos-latest, UTC0)	43s
timezones (macos-latest, Asia/Katmandu)	1m 7s
timezones (windows-latest, ACST-9:30)	1m 39s
timezones (windows-latest, EST4)	1m 37s
timezones (windows-latest, UTC0)	1m 43s
timezones (windows-latest, Asia/Katmandu)	1m 50s
	31m 30s

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