Try pinning even higher sphinx dependency versions

Author: dihm

pyproject.toml

@@ -63,9 +63,9 @@ Tracker = "https://github.com/labscript-suite/labscript-utils/issues/"
 [project.optional-dependencies]
 docs = [
     "PyQt5",
-    "Sphinx==7.3.7",
-    "sphinx-rtd-theme==2.0.0",
-    "myst_parser==2.0.0",
+    "Sphinx==8.1.3",
+    "sphinx-rtd-theme==3.0.1",
+    "myst_parser==4.0.0",
 ]
 
 [project.scripts]