*What version of crane are you running, and what are your clutsters+platform*

`crane version`
```
crane:
Version: v0.0.3
crane-lib:
Version: v0.0.6
```

Running crane cli and exporting a namespace on OpenShift 4.8.23

*What did you expect to happen?*
The crane export command to complete

*What actually happened?*
The crane command hangs in the `adding resource` stage, the command is stuck when trying to add image stream tags on namespaces with a lot of these objects. The namespace had 2707 image stream tags. When exporting a namespace with a small amount of image stream tags, the command works.
This did not happen on the previous version of crane-lib(v0.0.5). (I used the exact same namespace)

*Please include any relevant logs or errors*
```
DEBU[0005] processing resource: image.openshift.io/v1.ImageStream
INFO[0006] adding resource: imagestreams to the list of GVRs to be extracted
DEBU[0006] processing resource: image.openshift.io/v1.ImageStreamTag
```