rust Update Rust dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
base64	dependencies	minor	0.21 → 0.23
serde (source)	dependencies	patch	1.0.228 → 1.0.229
serde_json	dependencies	patch	1.0.149 → 1.0.151

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Release Notes

marshallpierce/rust-base64 (base64)

v0.23.1

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• Make the tests build again on non-SIMD architectures

v0.23.0

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• Added more consts for preconfigured configs and engines
• Make DecodeError::InvalidLastSymbol more clear by including the decoded value
• Added SIMD-accelerated engines behind the default-on simd-unsafe feature: Simd picks the best
  instruction set at runtime (AVX2 on x86_64, NEON on aarch64) and falls back to the scalar
  GeneralPurpose engine, while Avx2 and Neon target one instruction set with no runtime
  detection and work in no_std. The engines support the standard and URL-safe alphabets.
• Update MSRV to 1.71.0
• Add support for custom padding symbols

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%)

serde-rs/serde (serde)

v1.0.229

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• Update to syn 3

serde-rs/json (serde_json)

v1.0.151

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• Add RawValue::from_string_unchecked (#​1331, thanks @​WonderLawrence)

v1.0.150

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• Reject non-string enum object keys (#​1324, thanks @​puneetdixit200)

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