[BUG]: Fix Pull Request Template

[beanbeanjuice]

Is there an existing issue for this?

• [X] I have searched the existing issues and not found ones relating to my problem.

Version

N/A

What proxy/server software are you seeing this issue on?

BungeeCord, Waterfall, Velocity, Paper, Folia, Spigot, Purpur

What proxy software version are you using?

N/A

Current Behaviour

The pull request template still mentions Maven, when it should be Gradle instead.

Expected Behaviour

No response

Steps to Reproduce

N/A

Are you certain this is a bug report?

• [X] I am certain this is a bug report, and not a feature request, improvement request, or a security vulnerability.