Bump base64 from 0.13.0 to 0.13.1 in /src/_bcrypt (#447)

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.13.0 to 0.13.1.
- [Release notes](https://github.com/marshallpierce/rust-base64/releases)
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](https://github.com/marshallpierce/rust-base64/compare/v0.13.0...v0.13.1

)

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

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

src/_bcrypt/Cargo.lock

@@ -10,5 +10,5 @@
 
 [[package]]
 name = "base64"
-version = "0.13.0"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -14,5 +14,5 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
 [[package]]
 name = "bcrypt"

src/_bcrypt/Cargo.toml

@@ -9,7 +9,7 @@
 pyo3 = { version = "0.15.2" }
 bcrypt = "0.13"
 bcrypt-pbkdf = "0.8.1"
-base64 = "0.13.0"
+base64 = "0.13.1"
 
 [features]
 extension-module = ["pyo3/extension-module"]