build(deps): bump base64ct from 0.2.0 to 0.2.1 (#143)

Bumps [base64ct](https://github.com/RustCrypto/utils) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/RustCrypto/utils/releases)
- [Commits](RustCrypto/utils@base64ct-v0.2.0...base64ct-v0.2.1)

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