Update Rust crate base64 to v0.21.4 - autoclosed

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
base64	dependencies	patch	=0.21.2 -> =0.21.4

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Release Notes

marshallpierce/rust-base64 (base64)

v0.21.4

Compare Source

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

v0.21.3

Compare Source

• 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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Configuration

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