chore(deps): bump chrono from 0.4.20 to 0.4.22

[dependabot]

Bumps chrono from 0.4.20 to 0.4.22.

Release notes

Sourced from chrono's releases.

0.4.22

Unfortunately the introduction of the iana-time-zone dependency in 0.4.21 caused some new regressions with lesser known platforms. This release fixes all of the issues we've encountered, improving the situation on some WebAssembly targets, SGX and on macOS/iOS. We've improved our CI setup to hopefully catch more of these issues before release in the future.

• Make wasm-bindgen optional on wasm32-unknown-unknown target (#771)
• Avoid iana-time-zone dependency on x86_64-fortanix-unknown-sgx (#767, thanks to @​trevor-crypto)
• Update iana-time-zone version to 0.1.44 to avoid cyclic dependencies (#773, thanks to @​Kijewski for the upstream PRs)
• Clarify documentation about year range in formatting/parsing (#765)

0.4.21 is a bugfix release that mainly fixes one regression from 0.4.20:

• Fall back to UTC in case no timezone is found. Unfortunately this is a regression from the changes we made in 0.4.20 where we now parse the timezone database ourselves. Before 0.4.20, TimeZone::now() fell back to UTC in the case it could not find the current timezone, but the new implementation panicked in that case.
• Correctly detect timezone on Android (also #756). Android does have the timezone database installed, but it's in a different path, and it does not use /etc/localtime to keep track of the current timezone. Instead we now use the iana-time-zone crate as a dependency, since it already has quite a bit of logic for finding the current timezone on a host of platforms.

Additionally, there is a documentation fix that reverts an incorrect guarantee:

• Document that %Y can have a negative value, both in formatting and in parsing (#760, thanks to @​alex)

Changelog

Sourced from chrono's changelog.

0.4.22

• Allow wasmbindgen to be optional on wasm32-unknown-unknown target [(#771)](chronotope/chrono#771)
• Fix compile error for x86_64-fortanix-unknown-sgx [(#767)](chronotope/chrono#767)
• Update iana-time-zone version to 1.44 [(#773)](chronotope/chrono#773)

0.4.21

• Fall back to UTC timezone in cases where no timezone is found [(#756)](chronotope/chrono#756)
• Correctly detect timezone on Android [(#756)](chronotope/chrono#756)
• Improve documentation for strftime %Y specifier [(#760)](chronotope/chrono#760)

Commits

• 4514276 update changelog
• db8bde3 Apply clippy suggestions
• f6b575c Bump version number to 0.4.22
• af69b90 Require iana-time-zone 0.1.44
• 84f98e0 set fallback feature in iana-time-zone depedency
• 511d368 Add sgx build to CI
• bee614a Do not include iana-time-zone for sgx
• fe4bd22 allow optional wasmbindgen
• 95223ee format: be specific about support year range
• 2d22e57 Bump version number to 0.4.21
• Additional commits viewable in compare view

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