build(deps): bump base64 from 0.21.0 to 0.21.1

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.21.0 to 0.21.1.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](https://github.com/marshallpierce/rust-base64/commits)

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

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

Cargo.lock

@@ -220,9 +220,9 @@ checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
 [[package]]
 name = "base64"
-version = "0.21.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4a4ddaa51a5bc52a6948f74c06d20aaaddb71924eab79b8c97a8c556e942d6a"
+checksum = "3f1e31e207a6b8fb791a38ea3105e6cb541f55e4d029902d3039a4ad07cc4105"
 
 [[package]]
 name = "bdk"
@@ -3224,7 +3224,7 @@ version = "0.11.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cde824a14b7c14f85caff81225f411faacc04a2013f41670f41443742b1c1c55"
 dependencies = [
- "base64 0.21.0",
+ "base64 0.21.1",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -4124,7 +4124,7 @@ dependencies = [
  "async-trait",
  "atty",
  "backoff",
- "base64 0.21.0",
+ "base64 0.21.1",
  "bdk",
  "big-bytes",
  "bitcoin",