Bump aws-sigv4 from 1.1.3 to 1.1.4 (#13916)

Bump aws-sigv4 from 1.1.3 to 1.1.4 (#13916)

Bumps [aws-sigv4](https://github.com/aws/aws-sdk-ruby) from 1.1.3 to 1.1.4.
- [Release notes](https://github.com/aws/aws-sdk-ruby/releases)
- [Changelog](https://github.com/aws/aws-sdk-ruby/blob/master/gems/aws-sigv4/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-ruby/compare/1.1.3...1.1.4)

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