Update base64 requirement from 0.21 to 0.22

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
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

typesense/Cargo.toml

@@ -18,7 +18,7 @@ crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 anyhow = "1.0"
-base64 = "0.21"
+base64 = "0.22"
 hmac = "0.12"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1.0"