Dependencies: Permit installation of Sphinx 9.x

Author: amotl

CHANGES.rst

@@ -8,6 +8,7 @@ Unreleased
 - Made driver projects use a standalone primary navigation
 - Removed outmoded database drivers section
 - Added external-link icon to Support and Community TOC entries.
+- Dependencies: Permitted installation of Sphinx 9.x
 
 2026/01/14 0.47.0
 -----------------

setup.py

@@ -64,7 +64,7 @@
         "myst-nb<1.4",
         "myst-parser[linkify]<5",
         "snowballstemmer<4",
-        "sphinx>=7.1,<9",
+        "sphinx>=7.1,<10",
         "sphinx-basic-ng==1.0.0b2",
         "sphinx-copybutton>=0.3.1,<1",
         "sphinx-design-elements==0.4.1",