Bump boto3 from 1.35.14 to 1.35.21 (#1370)

Bumps [boto3](https://github.com/boto/boto3) from 1.35.14 to 1.35.21.
- [Release notes](https://github.com/boto/boto3/releases)
- [Commits](boto/boto3@1.35.14...1.35.21)

---
updated-dependencies:
- dependency-name: boto3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]