fix: Fix HPA ingester typo (grafana#13158)

**What this PR does / why we need it**:
This PR is necessary due to the presence of a typo. With the typo present the following error occurs:
```
no matches for kind "Statefulset" in group "apps"
```

**Which issue(s) this PR fixes**:
Fixes grafana#13152

production/helm/loki/CHANGELOG.md

@@ -13,6 +13,10 @@ Entries should include a reference to the pull request that introduced the chang
 
 [//]: # (<AUTOMATED_UPDATES_LOCATOR> : do not remove this line. This locator is used by the CI pipeline to automatically create a changelog entry for each new Loki release. Add other chart versions and respective changelog entries bellow this line.)
 
+## 6.6.6
+
+- [BUGFIX] Fix HPA ingester typo
+
 ## 6.6.5
 
 - [BUGFIX] Fix querier address in SingleBinary mode

production/helm/loki/Chart.yaml

@@ -3,7 +3,7 @@ name: loki
 description: Helm chart for Grafana Loki and Grafana Enterprise Logs supporting both simple, scalable and distributed modes.
 type: application
 appVersion: 3.0.0
-version: 6.6.5
+version: 6.6.6
 home: https://grafana.github.io/helm-charts
 sources:
   - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 6.6.5](https://img.shields.io/badge/Version-6.6.5-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 3.0.0](https://img.shields.io/badge/AppVersion-3.0.0-informational?style=flat-square)
+![Version: 6.6.6](https://img.shields.io/badge/Version-6.6.6-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 3.0.0](https://img.shields.io/badge/AppVersion-3.0.0-informational?style=flat-square)
 
 Helm chart for Grafana Loki and Grafana Enterprise Logs supporting both simple, scalable and distributed modes.
 

production/helm/loki/templates/ingester/hpa.yaml

@@ -11,7 +11,7 @@ metadata:
 spec:
   scaleTargetRef:
     apiVersion: apps/v1
-    kind: Statefulset
+    kind: StatefulSet
     name: {{ include "loki.ingesterFullname" . }}
   minReplicas: {{ .Values.ingester.autoscaling.minReplicas }}
   maxReplicas: {{ .Values.ingester.autoscaling.maxReplicas }}