Update release notes for 0.2.3

Merge pull request #3877 from AI-Hypercomputer:bvandermoon-remediate-…

…rce-deserialization

PiperOrigin-RevId: 914493298

Merge pull request #3875 from AI-Hypercomputer:nicogrande/improve-gem…

…ma4-vllm-perf

PiperOrigin-RevId: 914403579

Update MaxText version to v0.2.2 and add release notes.

PiperOrigin-RevId: 912602689

Merge pull request #3484 from AI-Hypercomputer:xpk_upgrade

PiperOrigin-RevId: 888298694

Merge pull request #3333 from AI-Hypercomputer:bvandermoon-temporary-…

…pypi-release

PiperOrigin-RevId: 879391680

Merge pull request #2898 from AI-Hypercomputer:tests_docker_image

PiperOrigin-RevId: 850456883

Introduce a DSv3 config with 2 logical fsdp sharding axes.

PiperOrigin-RevId: 843675516

Merge pull request #2706 from AI-Hypercomputer:mohit/tokamax_quant_gmm

PiperOrigin-RevId: 834605168

Merge pull request #2676 from AI-Hypercomputer:pypi_release

PiperOrigin-RevId: 832378885