Bump project version to 0.9.3 (#487)

Author: stefanocortinovis

gpjax/__init__.py

@@ -40,7 +40,7 @@
 __description__ = "Didactic Gaussian processes in JAX"
 __url__ = "https://github.com/JaxGaussianProcesses/GPJax"
 __contributors__ = "https://github.com/JaxGaussianProcesses/GPJax/graphs/contributors"
-__version__ = "0.9.2"
+__version__ = "0.9.3"
 
 __all__ = [
     "base",