set ONNX requirement to ==1.9.0

Author: Kiko-Aumond

setup.py

@@ -22,7 +22,7 @@
     # will be the one generated by the build process (1.9.0.xxxx), which
     # does not exist in the ONNX repo
     if onnx_version.startswith("1.9.0"):
-        onnx_dep = "onnx>=1.9.0"
+        onnx_dep = "onnx==1.9.0"
 
 try:
   git_version = subprocess.check_output(['git', 'rev-parse', 'HEAD'],