Changes:

- [#405] Forked gui communications fails sometimes when using IPv6 (fixed by #480) (pandaninjas)
- [#479] Added the system property `loader.fixPackageAccess` to allow enabling the package access fix in any namespace. (SpaceWalkerRS)
- [#481] Updated to Fabric Loader 0.17.3 (Codetoil)

Changes from updating Fabric Loader from 0.17.2 to 0.17.3:

- Updated ASM from 9.8 to 9.9
- Updated Mixin from 0.16.3 to 0.16.5
- Added support for 1.21.11 snapshot versions
- Add missing entrypoint support for pre-classic versions.
