build(deps-dev): update sphinx-thebe requirement from ~=0.1.1 to ~=0.2.1 (#1917)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Chris Holdgraf <choldgraf@berkeley.edu>

pyproject.toml

@@ -41,7 +41,7 @@ dependencies = [
     "sphinx-external-toc~=0.2.3",
     "sphinx-jupyterbook-latex~=0.4.6",
     "sphinx-design~=0.1.0",
-    "sphinx-thebe~=0.1.1",
+    "sphinx-thebe~=0.2.1",
     "sphinx_book_theme~=0.3.2",
     "sphinx_togglebutton",
     "sphinxcontrib-bibtex>=2.2.0,<=2.5.0",