build: pin sphinx version

setup.cfg

@@ -50,15 +50,22 @@ arfs.dataset.description =
 
 [options.extras_require]
 docs = 
-    nbsphinx
     ipykernel
     ipython_genutils
     pandoc
-    sphinx
-    sphinx-autodoc-typehints
-    sphinx-copybutton
-    sphinxawesome-theme
-    sphinx-tabs
+    sphinx==7.1.1
+    nbsphinx==0.9.2
+    sphinx-autodoc-typehints==1.24.0
+    sphinx-copybutton==0.5.2
+    sphinx-tabs==3.4.1
+    sphinxawesome-theme==4.1.0
+    sphinxcontrib-applehelp==1.0.4
+    sphinxcontrib-devhelp==1.0.2
+    sphinxcontrib-htmlhelp==2.0.1
+    sphinxcontrib-jquery==4.1
+    sphinxcontrib-jsmath==1.0.1
+    sphinxcontrib-qthelp==1.0.3
+    sphinxcontrib-serializinghtml==1.1.5
     fasttreeshap
 
 test =