Corrected name of package "cuda12-pip" (xai-org#194)

The `cuda12-pip` package was wrongly named `cuda12_pip`
in requirements.txt

Author: mane

requirements.txt

@@ -1,4 +1,4 @@
 dm_haiku==0.0.12
-jax[cuda12_pip]==0.4.25 -f https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
+jax[cuda12-pip]==0.4.25 -f https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
 numpy==1.26.4
 sentencepiece==0.2.0