fix #342, #345: cannot import name 'packaging' from 'pkg_resources'

backend-python/dep_check.py

@@ -1,3 +1,8 @@
+import setuptools
+
+if setuptools.__version__ >= "70.0.0":
+    raise ImportError("setuptools>=70.0.0 is not supported")
+
 import multipart
 import fitz
 import safetensors