Bump insipid-sphinx-theme from 0.3.2 to 0.4.4

Bumps [insipid-sphinx-theme](https://github.com/mgeier/insipid-sphinx-theme) from 0.3.2 to 0.4.4.
- [Release notes](https://github.com/mgeier/insipid-sphinx-theme/releases)
- [Changelog](https://github.com/mgeier/insipid-sphinx-theme/blob/master/NEWS.rst)
- [Commits](mgeier/insipid-sphinx-theme@0.3.2...0.4.4)

---
updated-dependencies:
- dependency-name: insipid-sphinx-theme
  dependency-version: 0.4.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]