Use last character of Python version to determine free threading

Removes the need to hardcode each specific "3.Xt" version we may support in future.

Co-authored-by: ChrisJL <ChrisLovering@users.noreply.github.com>

Author: jb3

bot/exts/utils/snekbox/_eval.py

@@ -141,7 +141,7 @@ def get_failed_files_str(self, char_max: int = 85) -> str:
 
     def get_status_message(self, job: EvalJob) -> str:
         """Return a user-friendly message corresponding to the process's return code."""
-        if job.version == "3.13t":
+        if job.version[-1] == "t":
             version_text = job.version.replace("t", " [free threaded](<https://docs.python.org/3.13/whatsnew/3.13.html#free-threaded-cpython>)")
         else:
             version_text = job.version