fix: update EDR negotiation request

[wadahiro]

Description

I noticed that due to the upgrade to EDC 0.4.1 in pull request eclipse-tractusx/tractusx-edc#877, the curl command for EDR negotiation mentioned in the README.md is causing the following error.

[
  {
    "message": "mandatory value 'https://w3id.org/edc/v0.0.1/ns/counterPartyAddress' is missing or it is blank",
    "type": "ValidationFailure",
    "path": "https://w3id.org/edc/v0.0.1/ns/counterPartyAddress",
    "invalidValue": null
  }
]

This pull request addresses the issue by modifying it to align with the schema of the updated EDR negotiation request.

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files

[wolf4ood]

Thanks @wadahiro