[clang-tidy][NFC] Remove py2 conditions from clang-tidy scripts (#154005)

Author: vbvictor

clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py

@@ -28,6 +28,7 @@
 import json
 import multiprocessing
 import os
+import queue
 import re
 import shutil
 import subprocess
@@ -42,13 +43,6 @@
 except ImportError:
     yaml = None
 
-is_py2 = sys.version[0] == "2"
-
-if is_py2:
-    import Queue as queue
-else:
-    import queue as queue
-
 
 def run_tidy(task_queue, lock, timeout, failed_files):
     watchdog = None