build(deps): Bump the observability-stack group with 4 updates

[dependabot]

Bumps the observability-stack group with 4 updates: otel/opentelemetry-collector-contrib, grafana/tempo, grafana/mimir and grafana/grafana.

Updates otel/opentelemetry-collector-contrib from 0.114.0 to 0.160.0-386

Updates grafana/tempo from 2.6.1 to 3.0.3

Updates grafana/mimir from 2.14.0 to 3.2.1

Updates grafana/grafana from 11.3.0 to 13.2.2

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[ChelseaKR]

Closing rather than merging. The collector tag Dependabot chose, otel/opentelemetry-collector-contrib:0.160.0-386, is the i386 platform variant, not the multi-arch image. The same group also takes three major versions at once (tempo 2.6 -> 3.0, mimir 2.14 -> 3.2, grafana 11.3 -> 13.2) whose mounted configs this repo would need to migrate, and CI does not start this compose stack, so green checks say nothing about whether it still runs. That upgrade is worth doing on purpose, with the configs checked against each release's migration notes.

[dependabot]

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