chore: bump unstructured to 0.18.18

backend/requirements.txt

@@ -63,7 +63,7 @@ fpdf2==2.8.2
 pymdown-extensions==10.14.2
 docx2txt==0.8
 python-pptx==1.0.2
-unstructured==0.18.15
+unstructured==0.18.18
 nltk==3.9.1
 Markdown==3.9
 pypandoc==1.15

pyproject.toml

@@ -73,7 +73,7 @@ dependencies = [
     "pymdown-extensions==10.14.2",
     "docx2txt==0.8",
     "python-pptx==1.0.2",
-    "unstructured==0.18.15",
+    "unstructured==0.18.18",
     "nltk==3.9.1",
     "Markdown==3.9",
     "pypandoc==1.15",