Apply suggestion from @aseembits93

Author: aseembits93

codeflash/api/aiservice.py

@@ -309,7 +309,7 @@ def get_new_explanation(  # noqa: D417
         original_throughput: str | None = None,
         optimized_throughput: str | None = None,
         throughput_improvement: str | None = None,
-        codeflash_version: str | None = "0.17.2",
+        codeflash_version: str = codeflash_version,
     ) -> str:
         """Optimize the given python code for performance by making a request to the Django endpoint.