build(deps): bump base64ct from 1.5.3 to 1.6.0 (#279)

Bumps [base64ct](https://github.com/RustCrypto/formats) from 1.5.3 to 1.6.0.
- [Release notes](https://github.com/RustCrypto/formats/releases)
- [Commits](https://github.com/RustCrypto/formats/compare/base64ct/v1.5.3...base64ct/v1.6.0)

---
updated-dependencies:
- dependency-name: base64ct
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Cargo.lock

@@ -21,9 +21,9 @@ checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "base64ct"
-version = "1.5.3"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b645a089122eccb6111b4f81cbc1a49f5900ac4666bb93ac027feaecf15607bf"
+checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
 [[package]]
 name = "block-buffer"