fix(deps): update rust crate base64 to 0.22 (v1)

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This PR contains the following updates:

Package	Type	Update	Change
base64	dependencies	minor	0.21 -> 0.22

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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

v0.21.5

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• Add Debug and Clone impls for the general purpose Engine

v0.21.4

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• Make encoded_len const, allowing the creation of arrays sized to encode compile-time-known data lengths

v0.21.3

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• Implement source instead of cause on Error types
• Roll back MSRV to 1.48.0 so Debian can continue to live in a time warp
• Slightly faster chunked encoding for short inputs
• Decrease binary size

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⚠️ Artifact update problem

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

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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 plugins/authenticator/Cargo.toml --package [email protected] --precise 0.22.1
    Updating crates.io index
error: failed to select a version for the requirement `base64 = "^0.21.0"`
candidate versions found which didn't match: 0.22.1
location searched: crates.io index
required by package `sqlx-mysql v0.7.1`
    ... which satisfies dependency `sqlx-mysql = "=0.7.1"` (locked to 0.7.1) of package `sqlx v0.7.1`
    ... which satisfies dependency `sqlx = "^0.7"` (locked to 0.7.1) of package `tauri-plugin-sql v0.0.0 (/tmp/renovate/repos/github/tauri-apps/plugins-workspace/plugins/sql)`
perhaps a crate was updated and forgotten to be re-vendored?

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