chore(deps): bump aws-encryption-sdk from 4.0.2 to 4.0.3

Bumps [aws-encryption-sdk](https://github.com/aws/aws-encryption-sdk-python) from 4.0.2 to 4.0.3.
- [Release notes](https://github.com/aws/aws-encryption-sdk-python/releases)
- [Changelog](https://github.com/aws/aws-encryption-sdk-python/blob/master/CHANGELOG.rst)
- [Commits](aws/aws-encryption-sdk-python@v4.0.2...v4.0.3)

---
updated-dependencies:
- dependency-name: aws-encryption-sdk
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]