Specify content filters for each maven repo

[SquidDev]

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Please check if the PR fulfills these requirements

• The commit message are well described
• All changes have fully been tested

What kind of change does this PR introduce? (Bug fix, feature, ...)

Bug fix.

What is the current behaviour? (You can also link to an open issue here)

A Gradle build with a clean cache can take a long time, as Gradle attempts to fetch every dependency from every Maven server. Yesterday I was having some connectivity issues to mvn.intelligence-modding.de, which caused just downloading Forge to take 10 minutes (let alone any of the mod dependencies)!

What is the new behaviour (if this is a feature change)?

This now adds content filters to all of the additional repos, meaning Gradle will now only try to download from:

• Maven Central
• NeoForged's repo
• The specific repo where the dependency is located.

We could prevent searching Maven Central and NeoForge by using exclusiveContent (example in Mekanism), but that's a bit of a bigger change