Bump sphinx-gallery from 0.19.0 to 0.20.0

Bumps [sphinx-gallery](https://github.com/sphinx-gallery/sphinx-gallery) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/sphinx-gallery/sphinx-gallery/releases)
- [Changelog](https://github.com/sphinx-gallery/sphinx-gallery/blob/master/CHANGES.rst)
- [Commits](sphinx-gallery/sphinx-gallery@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: sphinx-gallery
  dependency-version: 0.20.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -70,7 +70,7 @@ documentation = [
     "PyFiberModes",
     "numpydoc ==1.9.0",
     "sphinx >=5.1.1",
-    "sphinx-gallery ==0.19.0",
+    "sphinx-gallery ==0.20.0",
     "sphinx-rtd-theme ==3.0.2",
     "pydata-sphinx-theme ==0.16.0",
 ]