Checklist for making a release

In the release PR

[x] Updated version code in src/common/Version.hpp
[x] Updated version code in CMakeLists.txt
This can only be "whole versions", so if you're releasing 2.4.0-beta you'll need to condense it to 2.4.0
[x] Add a new release at the top of the releases key in resources/com.chatterino.chatterino.appdata.xml
This cannot use dash to denote a pre-release identifier, you have to use a tilde instead.
[x] Updated version code in .CI/chatterino-installer.iss
[x] Update the changelog ## Unreleased section to the new version CHANGELOG.md
Make sure to leave the ## Unreleased line unchanged for easier merges

[ ] Tag the release
[ ] Manually run the create-installer workflow.
This is only necessary if the tag was created after the CI in the main branch finished.
[ ] Start a manual Launchpad import - scroll down & click Import Now
[ ] Make a PPA release to this repo with the debchange command.
debchange -v 2.4.0 then add the changelog entries
debchange --release then change the distro to be unstable