Remove high entropy (outdated) token from postman collection

[matbmoser]

Description

It was found in this postman collection a "outdated" high entropy token.

https://github.com/eclipse-tractusx/portal-backend/blob/e6d3b08c2a979d2fc48e7c4649878371c29f9e84/postman/CatenaX Portal Registration local.postman_collection.json#L88

Please remove it.