Create a new release for the repository from the releases tab.
For tag version enter the desired version without the v (we will come back to this) against the main branch.
Title the release as you want, and enter a description as desired.
Creating the above release should trigger a build of the release workflow here.
Wait for that to complete successfully.
Our release should have created a new tag in the repository that matches the version we entered earlier prefaced with a v.
Open the release you made during step 1, select "edit release" in the top right.
Select the tag, box and enter a v in front of the existing version. Click update release
Go to the "tags" tab, find the tag we created during step 1, click it's name, and then click "Delete" in the top right.
Then confirm deletion.