build(deps-dev): update coconut requirement from <2.3.0,>=1.4.3 to >=1.4.3,<3.1.0 (#527)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -71,7 +71,7 @@ rtd = [
     "alabaster",
     "altair",
     "bokeh",
-    "coconut>=1.4.3,<2.3.0",
+    "coconut>=1.4.3,<3.1.0",
     "ipykernel~=5.5",
     "ipywidgets",
     "jupytext>=1.11.2,<1.15.0",