DEP(deps): Update sphinx-jinja2-compat requirement (#268)

Updates the requirements on [sphinx-jinja2-compat](https://github.com/sphinx-toolbox/sphinx-jinja2-compat) to permit the latest version.
- [Release notes](https://github.com/sphinx-toolbox/sphinx-jinja2-compat/releases)
- [Commits](sphinx-toolbox/sphinx-jinja2-compat@v0.1.1...v0.4.1)

---
updated-dependencies:
- dependency-name: sphinx-jinja2-compat
  dependency-version: 0.4.1
  dependency-type: direct:production
...

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Author: dependabot[bot]

docs/requirements.txt

@@ -2,7 +2,7 @@
 sphinx
 sphinx_rtd_theme
 sphinxcontrib-napoleon
-sphinx-jinja2-compat>=0.1.1
+sphinx-jinja2-compat>=0.4.1
 sphinx-toolbox>=2.16.0
 enum-tools[sphinx]
 pydata-sphinx-theme