Bump base64 from 0.13.0 to 0.13.1 (#859)

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](marshallpierce/rust-base64@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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Author: dependabot[bot]

Cargo.lock

@@ -13,5 +13,5 @@ image = "0.24.4"
 
 [target.'cfg(not(windows))'.dependencies]
 color_quant = "1.1.0"
-base64 = "0.13.0"
+base64 = "0.13.1"
 libc = "0.2.137"