Improve server version parsing for Minecraft 26.1+ builds

[Despical]

Summary

This PR fixes server version parsing in IridiumColorAPI for newer server version formats, including 26.1+ builds.

What was happening

IridiumColorAPI#getVersion() was using a fragile parsing approach that assumed older version formats such as 1.x.x-R0.1-SNAPSHOT.

With newer server versions, version strings can include different formats such as:

• 26.1.2-R0.1-SNAPSHOT
• 26.1.2-49-main@7799bf2 (2026-04-26T20:59:50Z)
• git-Paper-43 (MC: 1.20.1)

Because of that, the old logic could extract invalid substrings like .1 and throw a NumberFormatException during static initialization.

What changed

• Reworked getVersion() to extract the major version more safely
• Kept support for legacy 1.x.x style versions
• Added support for newer multi-part version formats, including 26.1+ style builds
• Added broader test coverage for multiple real-world version strings

Dependency metadata

This PR also updates the Spigot dependency setup so it is no longer published as a transitive runtime dependency.

The library only needs the Bukkit/Spigot API at compile time, while tests still keep access to it through the test configuration.