Merge pull request #3543 from open-webui/dependabot/pip/backend/dev/openpyxl-3.1.5

chore(deps): bump openpyxl from 3.1.2 to 3.1.5 in /backend

backend/requirements.txt

@@ -44,7 +44,7 @@ unstructured==0.14.0
 Markdown==3.6
 pypandoc==1.13
 pandas==2.2.2
-openpyxl==3.1.2
+openpyxl==3.1.5
 pyxlsb==1.0.10
 xlrd==2.0.1
 validators==0.28.1