bump Portainer to v2.0

[renehonig]

Describe the background of your pull request

Bump Portainer to next major release

Additional context

Portainer recently released v2.0

Governance

• [ ] Documentation is added
• [ ] Test cases are added or updated
• [ ] I've read the contributing document https://github.com/cherrytwist/.github/blob/master/CONTRIBUTING.md
• [ ] I've read and understand the Code of Conduct https://github.com/cherrytwist/.github/blob/master/CODE_OF_CONDUCT.md
• [ ] I understand that any contributions or suggestions I made may make it into the actual code. I've read the License https://github.com/cherrytwist/Coordination/blob/master/LICENSE and the contributor license agreement: tba