Update Sphinx dependency to a specific GitHub branch for bug fix

Author: m-aciek

requirements.txt

@@ -4,7 +4,7 @@ urllib3
 potodo
 jinja2
 docutils
-sphinx
+git+ssh://github.com/m-aciek/sphinx.git@copilot/fix-last-four-cases-issue-14162
 python-docs-theme
 dacite
 sphinx-lint