Bump pytest-doctestplus from 1.1.0 to 1.2.1 (#55)

Bumps [pytest-doctestplus](https://github.com/scientific-python/pytest-doctestplus) from 1.1.0 to 1.2.1.
- [Release notes](https://github.com/scientific-python/pytest-doctestplus/releases)
- [Changelog](https://github.com/scientific-python/pytest-doctestplus/blob/main/CHANGES.rst)
- [Commits](scientific-python/pytest-doctestplus@v1.1.0...v1.2.1)

---
updated-dependencies:
- dependency-name: pytest-doctestplus
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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pyproject.toml

@@ -24,7 +24,7 @@ towncrier = "^23.11.0"
 #%- if tests %#
 coverage = "^7.4.2"
 pytest = "^8.1.1"
-pytest-doctestplus = "^1.1.0"
+pytest-doctestplus = "^1.2.1"
 covdefaults = "^2.3.0"
 #%- endif %#
 poethepoet = "^0.25.0"