chore: update Sphinx version

Author: kenjis

user_guide_src/requirements.txt

@@ -1,5 +1,5 @@
-sphinx>=4.5.0,<5
-sphinxcontrib-phpdomain>=0.8.0
-docutils>=0.16
-sphinx-rtd-theme>=0.5.0
-jinja2<3.1
+sphinx>=5.3.0,<6.0.0
+sphinxcontrib-phpdomain>=0.11.0
+docutils>=0.19
+sphinx-rtd-theme>=2.0.0,<3.0.0
+jinja2>=3.1.3,<4.0.0