fix typo

requirements.txt

@@ -1,7 +1,7 @@
 # Python package requirements
 # Use "pip install -r requrements.txt"
 
-flax==0.6.3 chex==0.1.6 orbax==0.1.2 optaxftfy
+flax==0.6.3 chex==0.1.6 orbax==0.1.2 optax
 dalle-mini
 git+https://github.com/patil-suraj/vqgan-jax.git
 jax==0.3.25 -f https://storage.googleapis.com/jax-releases/jax_releases.html