dev: Avoid sphinx-markdown-tables 0.0.16 as it declares an incorrect dep

See <ryanfox/sphinx-markdown-tables#38>.

With the downgrade of Sphinx on 3.6 and 3.7 caused by "dev: Require
flake8 ≥4.0.0" (352b8d7), this incorrect dep declaration was causing
issues because Pip thought things were compatible when in reality the
docs build didn't work on those Python versions.

setup.py

@@ -133,7 +133,7 @@ def find_namespaced_packages(namespace):
             "sphinx>=3",
             "sphinx-argparse ~=0.3",
             "sphinx-autobuild",
-            "sphinx-markdown-tables",
+            "sphinx-markdown-tables !=0.0.16",
             "sphinx_rtd_theme",
             "types-docutils",
             "types-setuptools",