Update koku image tag and bump chart version to 0.2.20-rc1 (#143)

- Update koku image tag from 917373e to b5b6fc3
- Bump chart version from 0.2.19 to 0.2.20-rc1 using bump-version script

Signed-off-by: Moti Asayag <masayag@redhat.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: masayag

cost-onprem/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: cost-onprem
 description: Cost Management On-Premise solution for OpenShift
 type: application
-version: 0.2.19
-appVersion: "0.2.19"
+version: 0.2.20-rc1
+appVersion: "0.2.20-rc1"
 
 keywords:
   - cost-management

cost-onprem/values.yaml

@@ -147,7 +147,7 @@ costManagement:
 
     image:
       repository: quay.io/redhat-services-prod/cost-mgmt-dev-tenant/koku
-      tag: "917373e"
+      tag: "b5b6fc3"
       pullPolicy: Always
 
     replicas: 1