illegal char in event filtering

Describe the bug Cannot start boundary because of illegal char in event filtering. Boundary version： 0.15.0

To Reproduce Steps to reproduce the behavior:

Add below event sink:

  events {
    audit_enabled        = true
    observations_enabled = true
    sysevents_enabled    = true
    telemetry_enabled    = false

    sink "stderr" {
      name         = "all-events"
      description  = "All events sent to stderr"
      event_types  = ["*"]
      format       = "cloudevents-json"
      deny_filters = [
        '"/data/request_info/path" == "/health"'
      ]
    }
  }

Start boundary service see error:

Feb 06 04:47:28 ip-10-130-19-94 systemd[1]: Started "HashiCorp Boundary - Identity-based access management for dynamic infrastructure".
Feb 06 04:47:28 ip-10-130-19-94 boundary[874]: Error parsing config: Error parsing KMS HCL: At 15:7: illegal char
Feb 06 04:47:28 ip-10-130-19-94 systemd[1]: boundary.service: Main process exited, code=exited, status=3/NOTIMPLEMENTED
Feb 06 04:47:28 ip-10-130-19-94 systemd[1]: boundary.service: Failed with result 'exit-code'.
Feb 06 04:47:33 ip-10-130-19-94 systemd[1]: boundary.service: Scheduled restart job, restart counter is at 1.
Feb 06 04:47:33 ip-10-130-19-94 systemd[1]: Stopped "HashiCorp Boundary - Identity-based access management for dynamic infrastructure".

I don't see any wrong chars here by checking the docs, please help, thanks. I also tried allow_filters config from here, it reports the same error.

Expected behavior A clear and concise description of what you expected to happen.

Additional context Add any other context about the problem here.

hashicorp / boundary

illegal char in event filtering #4363