revert model fixation

Author: ofir-frd

pr_agent/settings/configuration.toml

@@ -7,7 +7,7 @@
 [config]
 # models
 model="o4-mini"
-fallback_models=["gpt-4.1-2025-04-14"]
+fallback_models=["gpt-4.1"]
 #model_reasoning="o4-mini" # dedictated reasoning model for self-reflection
 #model_weak="gpt-4o" # optional, a weaker model to use for some easier tasks
 # CLI