Add platform to UNSAFE_IMPORTS (GHSA-5cxw-w2xg-2m8h)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: thomas-chauchefoin-tob

fickling/fickle.py

@@ -140,6 +140,7 @@
         # File reading/enumeration
         "fileinput",
         "glob",
+        "platform",
         # Code compilation (writes .pyc files)
         "compileall",
         "py_compile",