chore(deps): update quay.io/cortexproject/cortex docker tag to v1.21.0 (#622)

* chore(deps): update quay.io/cortexproject/cortex docker tag to v1.21.0

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* update changelog

Signed-off-by: Tom Hayward <thayward@infoblox.com>

---------

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Signed-off-by: Tom Hayward <thayward@infoblox.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Tom Hayward <thayward@infoblox.com>

Author: renovate[bot]

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## master / unreleased
 
 * [FEATURE] Add a parquet labels cache. #621
+* [DEPENDENCY] update quay.io/cortexproject/cortex docker tag to v1.21.0 #622
 * [DEPENDENCY] update kiwigrid/k8s-sidecar docker tag to v2.7.1 #623
 
 ## 3.2.1 / 2026-04-20

Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 version: 3.2.1
-appVersion: v1.20.1
+appVersion: v1.21.0
 description: 'Horizontally scalable, highly available, multi-tenant, long term Prometheus.'
 home: https://cortexmetrics.io/
 icon: https://avatars2.githubusercontent.com/u/43045022?s=200&v=4

README.md

@@ -2,7 +2,7 @@
 
 # cortex
 
-![Version: 3.2.1](https://img.shields.io/badge/Version-3.2.1-informational?style=flat-square) ![AppVersion: v1.20.1](https://img.shields.io/badge/AppVersion-v1.20.1-informational?style=flat-square)
+![Version: 3.2.1](https://img.shields.io/badge/Version-3.2.1-informational?style=flat-square) ![AppVersion: v1.21.0](https://img.shields.io/badge/AppVersion-v1.21.0-informational?style=flat-square)
 
 Horizontally scalable, highly available, multi-tenant, long term Prometheus.