fix: unstructured md file parsing issue

backend/requirements.txt

@@ -44,7 +44,7 @@ sentence-transformers==3.0.1
 pypdf==4.3.1
 docx2txt==0.8
 python-pptx==1.0.0
-unstructured==0.15.0
+unstructured==0.15.5
 Markdown==3.6
 pypandoc==1.13
 pandas==2.2.2

pyproject.toml

@@ -51,7 +51,7 @@ dependencies = [
     "pypdf==4.3.1",
     "docx2txt==0.8",
     "python-pptx==1.0.0",
-    "unstructured==0.15.0",
+    "unstructured==0.15.5",
     "Markdown==3.6",
     "pypandoc==1.13",
     "pandas==2.2.2",