Stop using OSSRH (Migrate to Maven Central Publishing)

We've received the following email on releases@catppuccin.com

> Dear Maven Central publisher,
>
> We are making changes to the OSSRH authentication backend. For most users this should be a transparent process, and you should be able to continue to use your existing username and password to connect the Nexus UI. In case you need to update your password, please [follow our documentation](https://central.sonatype.org/register/central-portal/#managing-your-credentials).
>
> To configure a publisher's plugin authentication you would need to update your plugin settings to use [a user token](https://central.sonatype.org/publish/generate-token/) instead of the Nexus UI username and password login.
>
> For more information about publishing to legacy OSSRH please consult our documentation at [https://central.sonatype.org/register/legacy/](https://central.sonatype.org/register/legacy/)
>
> Thank you,
> The Central Team

I'm a little unsure if we are regarded as a "publisher" but we should look to see if we need to switch to a token based authentication workflow.