Bump ReportGenerator from 4.2.13 to 4.2.15
Bump ReportGenerator from 4.2.13 to 4.2.15

Bumps [ReportGenerator](https://github.com/danielpalme/ReportGenerator) from 4.2.13 to 4.2.15.
- [Release notes](https://github.com/danielpalme/ReportGenerator/releases)
- [Commits](https://github.com/danielpalme/ReportGenerator/compare/v4.2.13...v4.2.15)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
martincostello/browserstack-automate