Improve api version code validation#1303

### Describe what your pull request does and which issue you’re targeting This PR improves the validation of the version code received from the api. Closes #1287 <br><br> <!-- Make sure you are targeting the "main" branch, pull requests on release branches are only allowed for bug fixes. --> - [x] I carefully read the [contribution guidelines](https://codeberg.org/GitNex/GitNex/src/branch/main/CONTRIBUTING.md). - [x] I'm following the code standards as defined [here](https://codeberg.org/gitnex/GitNex/wiki/Code-Standards). - [x] By submitting this pull request, I permit GitNex to license my work under the [GNU General Public License v3](https://codeberg.org/GitNex/GitNex/src/branch/main/LICENSE).