chore(deps): update openpolicyagent/opa docker tag to v1.8.0

Author: renovate[bot]

charts/opa-nginx/values.yaml

@@ -9,7 +9,7 @@ opaNginx:
   authorizedKey: "allow"
   authorizedValue: "true"
 opa:
-  image: openpolicyagent/opa:1.6.0
+  image: openpolicyagent/opa:1.8.0
   imagePullPolicy: IfNotPresent
   logLevel: debug
 config: |