Version 0.3.1

Smaller environment/docker builds, leap second extension through mid 2024.

Maintenance

• dependency: drop scikit-image by @scottstanie in #67
• dependency: drop matplotlib by @yunjunz in #69
• build(deps): bump pypa/cibuildwheel from 2.12.1 to 2.14.1 by @dependabot in #57, #60, #62, #63
• pyproject.toml: add dynamic requirements from file by @scottstanie in #71
• update leap sec to Jun 2024 by @yunjunz in #68
• circleci: use mambaforge by @yunjunz in #58
• add docs/images/set*.png files by @yunjunz in #59

Full Changelog: v0.3.0...v0.3.1