Raise version to 2.0.1

Description

Raises the version number to 2.0.1 to celebrate the fixing of a bug.

Changes

The version number is now 2.0.1.

Test and Review

To be filled in by the reviewers

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date