Ghost User
2020-02-28T12:09:51+01:00

Replace Docker image used by Renovate.

### Why?
Apparently Renovate still uses [`thalia/python-thalia`](https://hub.docker.com/r/thalia/python-thalia). `thalia/python-thalia` is outdated and not automatically updated.

### Suggested implementation
Either [`renovate/python`](https://hub.docker.com/r/renovate/python) or [`thalia/concrexit-dependencies`](https://hub.docker.com/r/thalia/concrexit-dependencies).