Update CHANGELOG

Signed-off-by: Douglas Camata <159076+douglascamata@users.noreply.github.com>

CHANGELOG.md

@@ -37,6 +37,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#5641](https://github.com/thanos-io/thanos/pull/5641) Query: Inject unshardable le label in query analyzer.
 - [#5685](https://github.com/thanos-io/thanos/pull/5685) Receive: Make active/head series limiting configuration per tenant by adding it to new limiting config.
 - [#5411](https://github.com/thanos-io/thanos/pull/5411) Tracing: Change Jaeger exporter from OpenTracing to OpenTelemetry. *Options `RPC Metrics`, `Gen128Bit` and `Disabled` are now deprecated and won't have any effect when set :warning:.*
+- [#5767](https://github.com/thanos-io/thanos/pull/5767) *: Upgrade Prometheus to v2.39.0.
 
 ### Removed