Suppress pylint too-many-nested-blocks for bench()

The retry loop adds nesting depth beyond pylint's default limit.

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

Author: sbryngelson

toolchain/mfc/bench.py

@@ -16,7 +16,7 @@ class BenchCase:
     path: str
     args: typing.List[str]
 
-# pylint: disable=too-many-locals, too-many-branches, too-many-statements
+# pylint: disable=too-many-locals, too-many-branches, too-many-statements, too-many-nested-blocks
 def bench(targets = None):
     if targets is None:
         targets = ARG("targets")