build(deps): update base64 requirement (#46)

Updates the requirements on [base64](https://github.com/marshallpierce/rust-base64) to permit the latest version.

Updates `base64` to 0.23.1
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.22.0...v0.23.1)

---
updated-dependencies:
- dependency-name: base64
  dependency-version: 0.23.1
  dependency-type: direct:production
  dependency-group: rust-non-crypto
...

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Author: dependabot[bot]

impl/rust/pqf-reader/Cargo.toml

@@ -42,7 +42,7 @@ sha3 = "0.12"   # X-Wing combiner (SHA3-256)
 hkdf = "0.13"
 
 # Encoding utilities
-base64 = "0.22"
+base64 = "0.23"
 hex = "0.4"
 
 # Manifest deserialization for the conformance binary