Pin optimum version (due to GPTQ deprecation (#2359)

Author: karol-brejna-i

setup.py

@@ -30,7 +30,7 @@
 
 INSTALL_REQUIRES = [
     "transformers >= 4.55.0, < 4.56.0",
-    "optimum ~= 2.0",
+    "optimum >= 2.0.0, < 2.1.0",
     "torch",
     "accelerate >= 1.7.0",
     "diffusers >= 0.35.1, < 0.35.2",