Bump Serilog from 2.8.0 to 2.9.0
Bump Serilog from 2.8.0 to 2.9.0

Bumps [Serilog](https://github.com/serilog/serilog) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/serilog/serilog/releases)
- [Changelog](https://github.com/serilog/serilog/blob/dev/CHANGES.md)
- [Commits](https://github.com/serilog/serilog/compare/v2.8.0...v2.9.0)

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