libs/vertexai/v2.0.12

What's Changed

• Fix additional_headers fallback in validate_parms_base by @izo0x90 in #700
• fix linting by @lkuligin in #708
• vertexai: update standard tests library by @efriis in #704
• release 2.0.12 by @lkuligin in #709

New Contributors

• @izo0x90 made their first contribution in #700

Full Changelog: libs/genai/v2.0.9...libs/vertexai/v2.0.12