fix: Use correct flexible shape format VM.Standard.E4.Flex-8-32

- Based on troubleshooting guide, OCI provider expects format: VM.Standard.E4.Flex-OCPU-MEMORY
- Use 8 OCPU, 32GB RAM to support grafana-agent (5 CPU, 30GB requirements)
- Remove E5.Flex to simplify and test with single working shape first
- Bump to version 0.1.21

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: haimari

helm/karpenter-oci/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: karpenter-oci
 description: Karpenter with OCI provider support for Oracle Kubernetes Engine (OKE)
 type: application
-version: 0.1.20
+version: 0.1.21
 appVersion: "start-io-0207893"
 home: https://github.com/startappdev/karpenter
 sources:

helm/karpenter-oci/values.yaml

@@ -248,8 +248,7 @@ nodePools:
         - key: node.kubernetes.io/instance-type
           operator: In
           values:
-          - VM.Standard.E4.Flex
-          - VM.Standard.E5.Flex
+          - VM.Standard.E4.Flex-8-32
         - key: karpenter.sh/capacity-type
           operator: In
           values: