Update Sphinx dependency URL to use HTTPS

Author: m-aciek

requirements.txt

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