Merge #1388

1388: build(deps): bump base64 from 0.21.1 to 0.21.2 r=delta1 a=dependabot[bot]

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.21.1 to 0.21.2.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md">base64's changelog</a>.</em></p>
<blockquote>
<h1>0.21.2</h1>
<ul>
<li>Rollback MSRV to 1.57.0 -- only dev dependencies need 1.60, not the main code</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="1e8246a889"><code>1e8246a</code></a> v0.21.2</li>
<li><a href="13690af07e"><code>13690af</code></a> Merge pull request <a href="https://redirect.github.com/marshallpierce/rust-base64/issues/239">#239</a> from marshallpierce/mp/msrv</li>
<li><a href="02af00a56e"><code>02af00a</code></a> Roll back MSRV to 1.57.0</li>
<li><a href="09c790760d"><code>09c7907</code></a> Remove readme comments about benches needing nightly</li>
<li>See full diff in <a href="https://github.com/marshallpierce/rust-base64/compare/v0.21.1...v0.21.2">compare view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -220,9 +220,9 @@ checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
 [[package]]
 name = "base64"
-version = "0.21.1"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f1e31e207a6b8fb791a38ea3105e6cb541f55e4d029902d3039a4ad07cc4105"
+checksum = "604178f6c5c21f02dc555784810edfb88d34ac2c73b2eae109655649ee73ce3d"
 
 [[package]]
 name = "bdk"
@@ -3217,7 +3217,7 @@ version = "0.11.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cde824a14b7c14f85caff81225f411faacc04a2013f41670f41443742b1c1c55"
 dependencies = [
- "base64 0.21.1",
+ "base64 0.21.2",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -4117,7 +4117,7 @@ dependencies = [
  "async-trait",
  "atty",
  "backoff",
- "base64 0.21.1",
+ "base64 0.21.2",
  "bdk",
  "big-bytes",
  "bitcoin",