Merge pull request #94 from SimonBlanke/dependabot/pip/sphinx-gte-8.1.3

Update sphinx requirement from >=7.0.0 to >=8.1.3

Author: SimonBlanke

docs/requirements.txt

@@ -1,7 +1,7 @@
 # Requirements for building Surfaces documentation
 
 # Core Sphinx and extensions
-sphinx>=7.0.0
+sphinx>=8.1.3
 sphinx-autobuild
 sphinx-copybutton
 sphinx-design