Vela workflow addon upgrade fails when we try to upgrade from v0.5.0 to v0.6.0

[glaxman]

Vela workflow addon upgrade fails when we try to upgrade from v0.5.0 to v0.6.0

Error:

message:             run step(provider=oam,do=component-apply): Dispatch: pre-dispatch dryrun failed: Found 1 errors. [(cannot calculate patch by computing a three way diff: unable to find api field in │
│  struct ServiceAccount for the json field "labels")]                                                                                                                                                            │
│       Name:                vela-workflow-additional-privileges                                                                                                                                                  │
│       Phase:               failed                                                                                                                                                                               │
│       Reason:              FailedAfterRetries                                                                                                                                                                   │
│       Type:                apply-component

Steps to reproduce:

• vela addon enable vela-workflow --version v0.5.0
• vela addon enable vela-workflow --version v0.6.0