new release

Steps:

1. update in src/app.cpp macro constants the version of the software and its copyright year.
2. update in distrib/setup.nsi the version of the software.
3. commit the changes to master.
4. verify the CI pipeline is green, then download the Windows installer and Linux binary attached as artifact to the last run.
5. create a new GH release, provide a changelog and attach the Windows installer and Linux binary.