Bump chart version to test release (#7124)

**What this PR does / why we need it**:

Bumps the helm chart version to trigger a release to test if that action
is fixed.

production/helm/loki/Chart.yaml

@@ -3,7 +3,7 @@ name: loki
 description: Helm chart for Grafana Loki in simple, scalable mode
 type: application
 appVersion: 2.6.1
-version: 3.0.2
+version: 3.0.3
 home: https://grafana.github.io/helm-charts
 sources:
   - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 3.0.2](https://img.shields.io/badge/Version-3.0.2-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.6.1](https://img.shields.io/badge/AppVersion-2.6.1-informational?style=flat-square)
+![Version: 3.0.3](https://img.shields.io/badge/Version-3.0.3-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.6.1](https://img.shields.io/badge/AppVersion-2.6.1-informational?style=flat-square)
 
 Helm chart for Grafana Loki in simple, scalable mode