feat!(minecraft): update to 1.21.9

[gabizou]

Additions are mostly around CopperGolem and copper items.

Breaking Change:

• Removed Spawn Chunk Radius gamerule

See: https://minecraft.wiki/w/Java_Edition_25w31a#General_2
See: https://minecraft.wiki/w/Java_Edition_25w32a

This pull request updates the API to support new Minecraft blocks and dependencies, primarily by adding newly introduced block types and upgrading build tooling. The changes ensure compatibility with the latest Minecraft features and improve build reliability.

Block type additions (Minecraft 1.21 support):

• Added new shelf block types for all wood variants and related blocks (e.g., ACACIA_SHELF, BAMBOO_SHELF, BIRCH_SHELF, etc.) in BlockTypes.java. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]
• Added new copper-related block types, including bars, chain, chest, golem statue, lantern, torch, and wall torch for all copper states (regular, exposed, oxidized) in BlockTypes.java. [1] [2] [3]
• Added new lightning rod variants for exposed and oxidized copper in BlockTypes.java. [1] [2]

Build tooling and dependency updates:

• Upgraded the errorprone Gradle plugin from version 3.1.0 to 4.3.0 in gradle/libs.versions.toml and updated verification metadata accordingly. [1] [2] [3]
• Updated project version to 17.0.0-SNAPSHOT in gradle.properties to reflect the new API version.
• Added verification metadata for new Kotlin 2.0.21 artifacts, supporting newer Kotlin dependencies.

[Yeregorix]

Keys.PERFORM_SPAWN_LOGIC can probably be removed too.