Set up release 2.4.0

Description

Sets up release v2.4.0.

Changes

Version number increased to 2.4.0.

Additions

N/A

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