Bump base64 from 0.21.5 to 0.21.7

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.21.5 to 0.21.7.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.21.5...v0.21.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -15,7 +15,7 @@ actix-web-httpauth = "0.8.1"
 arc-swap = "1.6.0"
 askama = { version = "0.12.1", default-features = false }
 askama_actix = "0.14.0"
-base64 = { version = "0.21.5", default-features = false }
+base64 = { version = "0.21.7", default-features = false }
 bcrypt = "0.15.0"
 config = "0.13.4"
 env_logger = "0.10.1"
@@ -43,7 +43,7 @@ unic-langid = "0.9.4"
 url = { version = "2.5.0", features = ["serde"] }
 
 [build-dependencies]
-base64 = "0.21.5"
+base64 = "0.21.7"
 built = { version = "0.7.1", features = [ "git2" ] }
 cargo-license = "0.5.1"
 ignore = "0.4.21"