chore: bump boto3 from 1.17.78 to 1.17.84 (#449)

Bumps [boto3](https://github.com/boto/boto3) from 1.17.78 to 1.17.84.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.17.78...1.17.84)

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Author: dependabot[bot]