Changelog

• [CHANGE] Updated default align_queries_with_step to false to match documentation #513
• [ENHANCEMENT] Add nginx.config.upstream_protocol field to configure the upstream protocol in the nginx configuration #506
• [ENHANCEMENT] Add ability to set persistentVolumeClaimRetentionPolicy on alertmanager, ingester, compactor, and store-gateway StatefulSets #517
• [BUGFIX] fix: upstream_protocol reference in auth_orgs #509
• [DEPENDENCY] Update quay.io/cortexproject/cortex Docker tag to v1.18.1 #510