Bump AngleSharp from 0.14.0 to 0.15.0 in /PreMailer.Net/PreMailer.Net
Bump AngleSharp from 0.14.0 to 0.15.0 in /PreMailer.Net/PreMailer.Net

Bumps [AngleSharp](https://github.com/AngleSharp/AngleSharp) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/AngleSharp/AngleSharp/releases)
- [Commits](https://github.com/AngleSharp/AngleSharp/compare/v0.14.0...v0.15.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
milkshakesoftware/PreMailer.Net