Version 2.20.21

What's Changed

• feat: release VRM 1.0 SpringBone animation
• fix: "gltf_image_quality" may be required
• build(deps-dev): bump mypy from 1.7.0 to 1.7.1 by @dependabot in #373
• build(deps): bump idna from 3.5 to 3.6 by @dependabot in #374
• build(deps): bump cython from 3.0.5 to 3.0.6 by @dependabot in #375
• build(deps-dev): bump pyright from 1.1.337 to 1.1.338 by @dependabot in #377

Full Changelog: 2_20_20...2_20_21