build(deps): bump semver from 5.7.1 to 5.7.2 in /tests/performance_tests
    
    Bumps [semver](https://github.com/npm/node-semver) from 5.7.1 to 5.7.2.
    - [Release notes](https://github.com/npm/node-semver/releases)
    - [Changelog](https://github.com/npm/node-semver/blob/v5.7.2/CHANGELOG.md)
    - [Commits](https://github.com/npm/node-semver/compare/v5.7.1...v5.7.2)
    
    ---
    updated-dependencies:
    - dependency-name: semver
      dependency-type: indirect
    ...
    
    Signed-off-by: dependabot[bot] <support@github.com>