[MNT] [Dependabot](deps): Update sphinx-gallery requirement from <0.1…

…7.0 to <0.18.0 (#431)

Updates the requirements on
[sphinx-gallery](https://github.com/sphinx-gallery/sphinx-gallery) to
permit the latest version.

pyproject.toml

@@ -89,7 +89,7 @@ docs = [
     "sphinx<8.0.0,!=7.2.0",
     "sphinx-design<0.7.0",
     "sphinx-issues<5.0.0",
-    "sphinx-gallery<0.17.0",
+    "sphinx-gallery<0.18.0",
     "sphinx-panels",
     "tabulate",
 ]