fix(jax): remove jaxlib version pin to fix ARM64 compatibility

ROOT CAUSE:
jaxlib==0.4.8 has no pre-built wheels for ARM64 Linux, causing all
JAX-dependent tests to fail on GitHub Actions ARM64 runners.

CHANGES:
- Removed jaxlib==0.4.8 pin from dependencies
- JAX package will automatically install compatible jaxlib version

IMPACT:
- Fixes CI test failures on ARM64 Linux (GitHub Actions)
- JAX manages its own jaxlib dependency automatically
- No functional changes to code

FILES MODIFIED:
- pyproject.toml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: peter-luminova

pyproject.toml

@@ -51,7 +51,6 @@ pettingzoo = [
 ]
 jax = [
     "jax==0.4.8",
-    "jaxlib==0.4.8",
     "flax==0.6.8",
     "optax==0.1.4",
     "chex==0.1.5",