admin/doc-requirements: bump sphinx to 4.4.0

bump sphinx to latest stable. to address following build failure

ERROR: sphinx-autodoc-typehints 1.17.0 has requirement Sphinx>=4, but you'll have sphinx 3.5.4 which is incompatible.
ERROR: sphinx-substitution-extensions 2022.2.16 has requirement sphinx>=4.0.0, but you'll have sphinx 3.5.4 which is incompatible.

also bump bump sphinx-rtd-theme

otherwise we'd have

ERROR: sphinx-rtd-theme 0.5.2 has requirement docutils<0.17, but you'll have docutils 0.17.1 which is incompatible.

Signed-off-by: Kefu Chai <tchaikov@gmail.com>

admin/doc-requirements.txt

@@ -1,4 +1,4 @@
-Sphinx == 3.5.4
+Sphinx == 4.4.0
 git+https://github.com/ceph/sphinx-ditaa.git@py3#egg=sphinx-ditaa
 git+https://github.com/vlasovskikh/funcparserlib.git
 breathe >= 4.20.0,!=4.33
@@ -10,7 +10,7 @@ pcpp
 prettytable
 sphinx-autodoc-typehints
 sphinx-prompt
-sphinx_rtd_theme == 0.5.2
+sphinx_rtd_theme == 1.0.0
 Sphinx-Substitution-Extensions
 typed-ast
 sphinxcontrib-openapi