Support Minecraft 1.21.9: Replace deprecated VERSION_STRING with getCurrentVersion().name()

[Copilot]

This PR adds support for Minecraft 1.21.9 by updating the data generator code to work with API changes introduced in this version.

Changes

API Update

In Minecraft 1.21.9, Mojang removed the deprecated SharedConstants.VERSION_STRING constant and it must now be replaced with the dynamic method SharedConstants.getCurrentVersion().name().

Before (1.21.8 and earlier):

MinecraftDataGenerator.start(
    SharedConstants.VERSION_STRING,
    DGU.getCurrentlyRunningServer().getServerDirectory()
);

After (1.21.9):

MinecraftDataGenerator.start(
    SharedConstants.getCurrentVersion().name(),
    DGU.getCurrentlyRunningServer().getServerDirectory()
);

Files Modified

• mc/1.21.9/src/main/java/dev/u9g/minecraftdatagenerator/mixin/ReadyMixin.java - Updated version string retrieval
• mc/1.21.9/src/main/java/dev/u9g/minecraftdatagenerator/generators/EntitiesDataGenerator.java - Code formatting (spotless)
• mc/1.21.9/src/main/java/dev/u9g/minecraftdatagenerator/generators/RecipeDataGenerator.java - Import ordering (spotless)

Testing

✅ Build passes: ./gradlew :mc:1.21.9:build
✅ Data generation successful: ./gradlew :mc:1.21.9:runServer
✅ All 16 expected data files generated correctly
✅ Server correctly identifies as Minecraft version 1.21.9

Generated data files include: blocks, items, entities, effects, enchantments, recipes, biomes, particles, sounds, materials, foods, instruments, language, tints, attributes, and blockCollisionShapes.

Original prompt

Please help support minecraft 1.21.9 here, a new update from 1.21.8. Auto opened PR:
@PrismarineJS/minecraft-data-generator/pull/58

You need to help update the bump branch to support 1.21.9, see the relevant mojang code for reference on what to change in generator code

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