Update base64 requirement from 0.21 to 0.22 in /object_store (#5465)

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

object_store/Cargo.toml

@@ -44,7 +44,7 @@ url = "2.2"
 walkdir = "2"
 
 # Cloud storage support
-base64 = { version = "0.21", default-features = false, features = ["std"], optional = true }
+base64 = { version = "0.22", default-features = false, features = ["std"], optional = true }
 hyper = { version = "0.14", default-features = false, optional = true }
 quick-xml = { version = "0.31.0", features = ["serialize", "overlapped-lists"], optional = true }
 serde = { version = "1.0", default-features = false, features = ["derive"], optional = true }