renovate: Update Monitoring-Loki Docker tag to v2.7.3

This MR contains the following updates:

Package	Update	Change
Monitoring-Loki	patch	2.7.2 -> 2.7.3

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Release Notes

grafana/loki

v2.7.3

Compare Source

Loki

Fixes

• 8340 MasslessParticle Fix bug in compactor that caused panics when startTime and endTime of a delete request are equal.

Build

• 8232 TaehyunHwang Fix build issue that caused --version to show wrong version for Loki and Promtail binaries.

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