fix(deps): update rust crate base64 to ^0.22.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
base64	dependencies	minor	^0.21.5 -> ^0.22.0

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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%)

v0.21.7

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• Support getting an alphabet's contents as a str via Alphabet::as_str()

v0.21.6

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• Improved introductory documentation and example

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Configuration

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[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
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The artifact failure details are included below:

File name: Cargo.lock

Command failed: cargo update --config net.git-fetch-with-cli=true --manifest-path raiden/Cargo.toml --package [email protected] --precise 0.22.1
    Updating crates.io index
error: failed to select a version for the requirement `base64 = "^0.21"`
candidate versions found which didn't match: 0.22.1
location searched: crates.io index
required by package `rustls-pemfile v1.0.3`
    ... which satisfies dependency `rustls-pemfile = "^1"` (locked to 1.0.3) of package `rustls-native-certs v0.6.3`
    ... which satisfies dependency `rustls-native-certs = "^0.6"` (locked to 0.6.3) of package `hyper-rustls v0.23.2`
    ... which satisfies dependency `hyper-rustls = "^0.23"` (locked to 0.23.2) of package `rusoto_core v0.48.0`
    ... which satisfies dependency `rusoto_core = "^0.48.0"` (locked to 0.48.0) of package `rusoto_dynamodb v0.48.0`
perhaps a crate was updated and forgotten to be re-vendored?