docs: update 3rd party python-logging-loki to V2 that supports headers (backport release-3.4.x) (#16551)

Co-authored-by: Roman Rapoport <80348145+RomanR-dev@users.noreply.github.com>

docs/sources/send-data/_index.md

@@ -66,7 +66,7 @@ These third-party clients also enable sending logs to Loki:
 - [NLog-Targets-Loki](https://github.com/corentinaltepe/nlog.loki) (C#)
 - [promtail-client](https://github.com/afiskon/promtail-client) (Go)
 - [push-to-loki.py](https://github.com/sleleko/devops-kb/blob/master/python/push-to-loki.py) (Python 3)
-- [python-logging-loki](https://pypi.org/project/python-logging-loki/) (Python 3)
+- [python-logging-loki](https://pypi.org/project/python-logging-loki-v2/) (Python 3)
 - [nextlog](https://pypi.org/project/nextlog/) (Python 3)
 - [Rails Loki Exporter](https://github.com/planninghow/rails-loki-exporter) (Rails)
 - [Serilog-Sinks-Loki](https://github.com/JosephWoodward/Serilog-Sinks-Loki) (C#)