update Sphinx to 8.2.3 release (#1015)

Co-authored-by: Jeff McKenna <jmckenna@gatewaygeomatics.com>

Author: github-actions[bot]

requirements.txt

@@ -1,6 +1,6 @@
 alabaster==1.0.0
 docutils==0.21.2
-sphinx==8.2.1
+sphinx==8.2.3
 sphinx-copybutton==0.5.2
 sphinxcontrib-jquery==4.1
 --extra-index-url https://test.pypi.org/simple/