fix(keycloak): correct the encryption proxy image tag (0.2.0, no v)

The release workflow publishes the OCI tag as 0.2.0 (docker/metadata-action
strips the leading v from the git tag), so the chart default of v0.2.0 does
not exist and pulls fail. Pin the real tag.

Signed-off-by: Kirill Ilin <stitch14@yandex.ru>

packages/system/keycloak/values.yaml

@@ -92,7 +92,7 @@ extraEnv: []
 #     MUST be part of the backup set. For production prefer kms.backend=vault-transit.
 encryption:
   enabled: false
-  image: ghcr.io/cozystack/keycloak-kms-proxy:v0.2.0
+  image: ghcr.io/cozystack/keycloak-kms-proxy:0.2.0
   # Encrypted field set: "" = full default set (username, email, names,
   # PII attributes, credentials), "email-only", or "disabled" (passthrough).
   fields: ""