Pin sphinx for docs

can't find it in read the docs, I presume this is because it's using
py3.7

Author: ryantam626

pyproject.toml

@@ -54,7 +54,7 @@ test = [
 ]
 docs = [
     "furo",
-    "sphinx"
+    "sphinx==5.3.0"
 ]
 
 [tool.hatch.envs.default]

requirements-docs.txt

@@ -8,7 +8,7 @@ furo==2023.3.27
 imagesize==1.4.1
 requests==2.30.0
 snowballstemmer==2.2.0
-Sphinx==6.2.1
+Sphinx==5.3.0
 sphinx-basic-ng==1.0.0b1
 sphinxcontrib-applehelp==1.0.4
 sphinxcontrib-devhelp==1.0.2