Unpin jupyter-client docs requirement (#2468)

* Update pyproject.toml

* Update release_notes.rst

---------

Co-authored-by: Gaurav Sheni <gvsheni@gmail.com>

Author: rwedge

docs/source/release_notes.rst

@@ -15,11 +15,12 @@ Future Release
     * Documentation Changes
         * Update ``release.md`` with instructions for launching Looking Glass performance test runs (:pr:`2461`)
         * Pin ``jupyter-client==7.4.9`` to fix broken documentation build (:pr:`2463`) 
+        * Unpin jupyter-client documentation requirement (:pr:`2468`) 
     * Testing Changes
         * Add test suites for ``NumWords`` and ``NumCharacters`` primitives (:pr:`2459`, :pr:`2463`)
 
     Thanks to the following people for contributing to this release:
-    :user:`gsheni`, :user:`sbadithe`, :user:`thehomebrewnerd`
+    :user:`gsheni`, :user:`rwedge`, :user:`sbadithe`, :user:`thehomebrewnerd`
 
 v1.21.0 Jan 18, 2023
 ====================

pyproject.toml

@@ -92,7 +92,7 @@ sklearn = [
 docs = [
     "ipython == 8.4.0",
     "jupyter == 1.0.0",
-    "jupyter-client==7.4.9",
+    "jupyter-client >= 8.0.2",
     "matplotlib == 3.5.2",
     "Sphinx == 5.1.1",
     "nbsphinx == 0.8.9",