Bump aws4 from 1.13.0 to 1.13.2

Bumps [aws4](https://github.com/mhart/aws4) from 1.13.0 to 1.13.2.
- [Release notes](https://github.com/mhart/aws4/releases)
- [Commits](mhart/aws4@v1.13.0...v1.13.2)

---
updated-dependencies:
- dependency-name: aws4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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