Bump base64 from 0.21.4 to 0.21.5 in /src/_bcrypt (#654)

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.21.4 to 0.21.5.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](https://github.com/marshallpierce/rust-base64/compare/v0.21.4...v0.21.5)

---
updated-dependencies:
- dependency-name: base64
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/_bcrypt/Cargo.lock

@@ -10,9 +10,9 @@ checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "base64"
-version = "0.21.4"
+version = "0.21.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ba43ea6f343b788c8764558649e08df62f86c6ef251fdaeb1ffd010a9ae50a2"
+checksum = "35636a1494ede3b646cc98f74f8e62c773a38a659ebc777a2cf26b9b74171df9"
 
 [[package]]
 name = "bcrypt"

src/_bcrypt/Cargo.toml

@@ -9,7 +9,7 @@ publish = false
 pyo3 = { version = "0.20.0" }
 bcrypt = "0.15"
 bcrypt-pbkdf = "0.10.0"
-base64 = "0.21.4"
+base64 = "0.21.5"
 
 [features]
 extension-module = ["pyo3/extension-module"]