rust Update Rust dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
base64	dependencies	minor	0.21 → 0.22
base64-serde	dependencies	minor	0.7 → 0.8
chrono	dependencies	patch	0.4.43 → 0.4.44

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Release Notes

marshallpierce/rust-base64 (base64)

v0.22.1

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• Correct the symbols used for the predefined alphabet::BIN_HEX.

v0.22.0

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• DecodeSliceError::OutputSliceTooSmall is now conservative rather than precise. That is, the error will only occur if the decoded output cannot fit, meaning that Engine::decode_slice can now be used with exactly-sized output slices. As part of this, Engine::internal_decode now returns DecodeSliceError instead of DecodeError, but that is not expected to affect any external callers.
• DecodeError::InvalidLength now refers specifically to the number of valid symbols being invalid (i.e. len % 4 == 1), rather than just the number of input bytes. This avoids confusing scenarios when based on interpretation you could make a case for either InvalidLength or InvalidByte being appropriate.
• Decoding is somewhat faster (5-10%)

marshallpierce/base64-serde (base64-serde)

v0.8.0

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• Don't depend on base64 and serde directly; instead, assume the consumer of the library is going to already have
  them available. This avoids the need to do version bumps in this project, and should hopefully be a no op for common
  usage, since any usage I can think of would already be using dependencies independently.

chronotope/chrono (chrono)

v0.4.44: 0.4.44

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What's Changed

• docs: match MSRV with Cargo.toml contents by @​coryan in #​1772
• Add track_caller to non-deprecated functions by @​svix-jplatte in #​1774

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