Fix cpplint sre_compile deprecation warning (#262)

sre_compile is an implementation detail of the re module that moved in
Python 3.11.

Author: calcmogul

wpiformat/wpiformat/cpplint.py

@@ -49,10 +49,14 @@
 import math  # for log
 import os
 import regex
-import sre_compile
 import string
 import sys
 
+try:
+    import re._compiler as sre_compile
+except ImportError:  # Python < 3.11
+    import sre_compile
+
 # if empty, use defaults
 _header_regex = regex.compile("a^")