Merge pull request #16198 from open-webui/dependabot/pip/backend/dev/markdown-3.8.2

chore(deps): bump markdown from 3.7 to 3.8.2 in /backend

backend/requirements.txt

@@ -75,7 +75,7 @@ docx2txt==0.8
 python-pptx==1.0.2
 unstructured==0.16.17
 nltk==3.9.1
-Markdown==3.7
+Markdown==3.8.2
 pypandoc==1.15
 pandas==2.2.3
 openpyxl==3.1.5