Update plugin net.minecraftforge.gradle to v7

Author: renovate[bot]

settings.gradle

@@ -23,7 +23,7 @@ pluginManagement {
 
 		id "net.neoforged.gradle.userdev" version "7.0.+"
 
-		id "net.minecraftforge.gradle" version "6.0.+"
+		id "net.minecraftforge.gradle" version "7.0.+"
 		id "org.parchmentmc.librarian.forgegradle" version "1.+"
 		id "org.spongepowered.mixin" version "0.7.+"