Ignite v0.8.1

Additions:

• Made 1.19.3 the default version for bootstrap services.
• Moved example project to a seperate template repository. (https://github.com/vectrix-space/ignite-mod-template)

Fixes:

• Fixes compatibility with older Java versions by removing the nullability annotations from Guice injection targets. (#120)

Dependency Updates:

• Bumped sponge-mixin to 0.11.4+mixin.0.8.5.
• Bumped modlauncher to 8.1.3.
• Bumped log4j to 2.19.0.
• Bumped gson to 2.10.1.
• Bumped jline to 3.22.0.
• Bumped gradle wrapper to 7.6.
• Bumped checker-qual to 3.30.0.
• Bumped errorprone to 2.18.
• Bumped indra to 2.2.0.