[Feature] Add gitlab to checkver

[superusercode]

Feature Request

Is your feature request related to a problem? Please describe.

I want to do checkver for gitlab tags without using regex.

Describe the solution you'd like

Implement checkver for gitlab tags.

Describe alternatives you've considered

I've tried just outright copying the gitlab api/atom link, it has weird exceptions like https://gitlab.com/re-volt/rvgl-assets/-/tags

[rashil2000]

Hi! Would you like to work on this feature?

[Capella87]

@rashil2000 Hello, I've interested in this issue and want to contribute on it, could I work on that issue?