Add CHANGELOG.md entry.

Signed-off-by: Peter Štibraný <[email protected]>

CHANGELOG.md

@@ -10,6 +10,7 @@
 * [CHANGE] Ingester: changed default `-blocks-storage.tsdb.series-hash-cache-max-size-bytes` setting from `1GB` to `350MB`. The new default cache size is enough to store the hashes for all series in a ingester, assuming up to 2M in-memory series per ingester and using the default 13h retention period for local TSDB blocks in the ingesters. #6129
 * [CHANGE] Query-frontend: removed `cortex_query_frontend_workers_enqueued_requests_total`. Use `cortex_query_frontend_enqueue_duration_seconds_count` instead. #6121
 * [CHANGE] Ingester: changed the default value for the experimental configuration parameter `-blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage` from 10 to 15. #6186
+* [CHANGE] Update Go version to 1.21.2. #6244
 * [FEATURE] Query-frontend: add experimental support for query blocking. Queries are blocked on a per-tenant basis and is configured via the limit `blocked_queries`. #5609
 * [FEATURE] Vault: Added support for new Vault authentication methods: `AppRole`, `Kubernetes`, `UserPass` and `Token`. #6143
 * [ENHANCEMENT] Ingester: exported summary `cortex_ingester_inflight_push_requests_summary` tracking total number of inflight requests in percentile buckets. #5845