v9.0.0-beta.21

What's Changed

Bug Fixes 🐛

• fix(lance-core): avoid aliasing &mut Runtime in global_cpu_runtime by @LuciferYang in #7682
• fix: round-trip empty blob values in the 2.1+ structural encoding by @wkalt in #7717

Performance Improvements 🚀

• perf(index): pack prewarmed FTS posting groups by @BubbleCal in #7720

Full Changelog: v9.0.0-beta.20...v9.0.0-beta.21