chore(deps-dev): bump @aws-sdk/client-s3 from 3.515.0 to 3.521.0

Bumps [@aws-sdk/client-s3](https://github.com/aws/aws-sdk-js-v3/tree/HEAD/clients/client-s3) from 3.515.0 to 3.521.0.
- [Release notes](https://github.com/aws/aws-sdk-js-v3/releases)
- [Changelog](https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-s3/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js-v3/commits/v3.521.0/clients/client-s3)

---
updated-dependencies:
- dependency-name: "@aws-sdk/client-s3"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -33,7 +33,7 @@
     "@11ty/eleventy-img": "^4.0.2",
     "@11ty/eleventy-plugin-rss": "^1.2.0",
     "@11ty/eleventy-plugin-syntaxhighlight": "^5.0.0",
-    "@aws-sdk/client-s3": "^3.373.0",
+    "@aws-sdk/client-s3": "^3.521.0",
     "@rknightuk/eleventy-plugin-post-graph": "^1.0.6",
     "child_process": "^1.0.2",
     "dotenv-flow": "^4.1.0",