update to Sphinx to 8.1.3 in order to support Python 3.14 (open-telemetry#5278)

Author: herin049

dev-requirements.txt

@@ -2,8 +2,8 @@ pylint==3.3.4
 httpretty==1.1.4
 mocket==3.14.1
 pyright==1.1.405
-sphinx==7.1.2
-sphinx-rtd-theme==2.0.0rc4
+sphinx==8.1.3
+sphinx-rtd-theme==3.1.0
 sphinx-autodoc-typehints==1.25.2
 pytest==7.4.4
 pytest-cov==4.1.0

docs-requirements.txt

@@ -1,5 +1,5 @@
-sphinx==7.1.2
-sphinx-rtd-theme==2.0.0rc4
+sphinx==8.1.3
+sphinx-rtd-theme==3.1.0
 sphinx-autodoc-typehints==1.25.2
 # used to generate docs for the website
 sphinx-jekyll-builder==0.3.0