Bump the all group with 1 update (#165)

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

Updates `base64` to 0.22.0
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.21.2...v0.22.0)

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

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

Cargo.toml

@@ -14,7 +14,7 @@ readme = "README.md"
 repository = "https://github.com/sbstp/attohttpc"
 
 [dependencies]
-base64 = {version = "0.21.2", optional = true}
+base64 = {version = "0.22.0", optional = true}
 encoding_rs = {version = "0.8.31", optional = true}
 encoding_rs_io = {version = "0.1.7", optional = true}
 flate2 = {version = "1.0.24", default-features = false, optional = true}