fix slimefun blocks turning into vanilla blocks for 1.20.1 and lower

[J3fftw1]

Description

You might be having a deja vu.
This PR fixes Slimefun blocks turning into vanilla blocks on 1.20 and 1.20.1

Proposed changes

add a different version check

Related Issues (if applicable)

#4103

Checklist

• I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• [x I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.

[github-actions]

Your Pull Request was automatically labelled as: "✨ Fix"
Thank you for contributing to this project! ❤️

[github-actions]

Slimefun preview build

A Slimefun preview build is available for testing!
Commit: 2fa967a6

https://preview-builds.walshy.dev/download/Slimefun/4105/2fa967a6

Note: This is not a supported build and is only here for the purposes of testing.
Do not run this on a live server and do not report bugs anywhere but this PR!

[JustAHuman-xD]

As long as this has been tested then it’s good