fix: remove logging of potentially secret value

[Flydiverny]

If one misconfigures a secret these can end up in logs, which could be quite a hassle :)

Example:

...
secretDescriptor:
  backendType: secretsManager
  data:
    - key: hello-service/credentials
      property: password
      name: password

hello-service/credentials from secrets manager:

{
    "Name": "hello-service/credentials",
    "SecretString": "my-super-secret-password",
    ...
}

Would log the following

Failed to JSON.parse 'my-super-secret-password': {}

[silasbw]

Doh! 🙏 💯

[silasbw]

👍

Let me know what you think about #97 (comment) :)

[silasbw]

This change is included in godaddy/kubernetes-external-secrets:1.3.0.