Version 0.3.1

@scottstanie

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

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

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