Merge pull request #4785 from open-webui/dependabot/pip/backend/dev/markdown-3.7

chore(deps): bump markdown from 3.6 to 3.7 in /backend

backend/requirements.txt

@@ -45,7 +45,7 @@ pypdf==4.3.1
 docx2txt==0.8
 python-pptx==1.0.0
 unstructured==0.15.7
-Markdown==3.6
+Markdown==3.7
 pypandoc==1.13
 pandas==2.2.2
 openpyxl==3.1.5