v1.12.1b1

What's Changed

• pickle dictionary when it isn't JSON serializable by @samhita-alla in #2390
• Deprecate cron_expression by @eapolinario in #2402
• Use uv in CI and to build images by @eapolinario in #2403
• feat: Support ftp when using FlyteFile by @ggydush in #2409
• fix(ImageSpec): Ensure all APIErrors return a value by @pingsutw in #2408
• Adds jinja2 to dependnecies by @thomasjpfan in #2413
• refactor(click_types): skip serialization for default values by @pingsutw in #2418
• Fix UV install in Makefile by @thomasjpfan in #2421
• Adds flytekitplugin.wandb by @thomasjpfan in #2405

Full Changelog: v1.12.1b0...v1.12.1b1