[feature] Update `Serilog.Sinks.PeriodicBatching` to `3.1.0`

[NielsPilgaard]

Status

READY

Whats?

• [x] Update Serilog.Sinks.PeriodicBatching to 3.1.0
• [x] Implement IBatchedLogEventSink instead of inheriting from PeriodicBatchingSink as recommended in the README.

Why?

I'm troubleshooting an issue with dropped log messages, and having PeriodicBatchingSink up-to-date would allow me to debug more precisely, and report issues if I find any.

How?

I updated the PeriodicBatchingSink implementation to follow their current usage guidelines.

Attachments (if appropriate)

Add additional informations like screenshots, issue link, zendesk ticket link, jira task link, etc

Definition of Done:

• [ ] Increases API documentation
• [ ] Implements integration tests
• [ ] Implements unit tests
• [ ] Is there appropriate logging included?
• [ ] Does this add new dependencies?
• [x] Does need add new version in changelog?
• [ ] Does need update readme, contributing, etc?
• [ ] Does need change in CI server?
• [ ] Will this feature require a new piece of infrastructure be implemented?
• [ ] Does this PR require a blog post? If so, ensure marketing has signed off on content.