Update dependency Serilog.Sinks.Grafana.Loki to v5.1.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
Serilog.Sinks.Grafana.Loki	nuget	minor	5.0.0 -> 5.1.3

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Release Notes

mishamyte/serilog-sinks-grafana-loki

### [`v5.1.3`](https://togithub.com/mishamyte/serilog-sinks-grafana-loki/releases/v5.1.3) - Implemented [Added null check to stacktrace](https://togithub.com/mishamyte/serilog-sinks-grafana-loki/pull/25) ### [`v5.1.2`](https://togithub.com/mishamyte/serilog-sinks-grafana-loki/releases/v5.1.2) - Implemented [Optimize streams grouping log entries](https://togithub.com/mishamyte/serilog-sinks-grafana-loki/issues/17) - Implemented [Add json formatter to support Loki 2.0 json parser](https://togithub.com/mishamyte/serilog-sinks-grafana-loki/issues/18) - Implemented [Only write exception message when it exists](https://togithub.com/mishamyte/serilog-sinks-grafana-loki/pull/22) For this awesome changes thanks to [@​AnderssonPeter](https://togithub.com/AnderssonPeter)

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