Remove extra new line. (#400)

* Remove extra new line.

* blacken

---------

Co-authored-by: Mark McDonald <macd@google.com>

Author: MarkDaoust

google/generativeai/types/generation_types.py

@@ -449,7 +449,7 @@ def text(self):
                     language = ""
                 else:
                     language = f" {language}"
-                texts.extend([f"```{language}", part.executable_code.code, "```"])
+                texts.extend([f"```{language}", part.executable_code.code.lstrip("\n"), "```"])
                 continue
             if "code_execution_result" in part:
                 outcome_result = part.code_execution_result.outcome.name.lower().replace(