Update base64 requirement from 0.21 to 0.22 (#22)

Updates the requirements on [base64](https://github.com/marshallpierce/rust-base64) to permit the latest version.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.21.0...v0.22.0)

---
updated-dependencies:
- dependency-name: base64
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

client/Cargo.toml

@@ -13,7 +13,7 @@ keywords.workspace = true
 [dependencies]
 async-stream = "0.3"
 async-trait = "0.1"
-base64 = { version = "0.21", optional = true }
+base64 = { version = "0.22", optional = true }
 futures = "0.3"
 http = { version = "0.2", optional = true }
 js-sys = { version = "0.3", optional = true }