Update dependency grafana/loki to v2.6.1

This MR contains the following updates:

Package	Type	Update	Change
grafana/loki	ironbank-docker	patch	2.6.0 -> 2.6.1
grafana/loki		patch	2.6.0 -> 2.6.1
grafana/loki	stage	patch	2.6.0 -> 2.6.1

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Release Notes

grafana/loki

v2.6.1

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All Changes

• 6658 Updated the versions of dskit and memberlist to allow configuring cluster labels for memberlist. Cluster labels prevent mixing the members between two consistent hash rings of separate applications that are run in the same Kubernetes cluster.
• 6681 Fixed an HTTP connection leak between the querier and the compactor when the log entry deletion feature is enabled.
• 6583 Fixed noisy error messages when the log entry deletion feature is disabled for a tenant.

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