fix: bump version of lxml

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

Author: PeterStaar-IBM

pyproject.toml

@@ -28,7 +28,7 @@ dependencies = [
     "docling>=2.56.1,<3.0.0",
     "docling-core>=2.48.0,<3.0.0",
     'pydantic (>=2.0.0,<3.0.0)',
-    'lxml (>=5.3.0,<6.0.0)',
+    'lxml (>=5.3.0,<7.0.0)',
     'datasets (>=3.2.0,<5.0.0)',
     'apted (>=1.0.3,<2.0.0)',
     'Distance (>=0.1.3,<0.2.0)',