Create 0.2.21 jax release

PiperOrigin-RevId: 398528427

Merge pull request jax-ml#7793 from yashk2810:update_pypi

PiperOrigin-RevId: 394697075

Merge pull request jax-ml#7774 from yashk2810:workspace

PiperOrigin-RevId: 394233543

jax version 0.2.19

Update WORKSPACE

PiperOrigin-RevId: 389037137

jax version 0.2.18

jaxlib version 0.1.69

jax version 0.2.17

jaxlib version 0.1.68

jax version 0.2.16