MAINT - Bump node version (22.x) (pydata#1993)

We currently use `node.js 16` for PST, which has long been out of LTS.

This PR bumps node to v22, which is the _Current_ version and will soon
be moved to _Active_.

Ref: https://nodejs.org/en/about/previous-releases

pyproject.toml

@@ -5,7 +5,7 @@ requires = [
 build-backend = "sphinx_theme_builder"
 
 [tool.sphinx-theme-builder]
-node-version = "16.13.2"
+node-version = "22.9.0"
 theme-name = "pydata_sphinx_theme"
 additional-compiled-static-assets = [
   "webpack-macros.html",