Raise the version to v2.3.4

Description

Raises the version to 2.3.4.

Changes

• Raises the version to 2.3.4.

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