tools: allow icutrim.py to run on python2

Refs: nodejs/build#2998

Small icu seems broken from 14.x since it uses
python2. Although main no longer supports python2
landing and backporting this change to the 14.x line would
allow us to simplify future backports as currently
the files are the same across lines.

Signed-off-by: Michael Dawson <mdawson@devrus.com>
PR-URL: #46263
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/icu/icutrim.py

@@ -316,7 +316,7 @@ def removeList(count=0):
             erritems = fi.readlines()
             fi.close()
             #Item zone/zh_Hant_TW.res depends on missing item zone/zh_Hant.res
-            pat = re.compile(bytes(r"^Item ([^ ]+) depends on missing item ([^ ]+).*", 'utf-8'))
+            pat = re.compile(br"^Item ([^ ]+) depends on missing item ([^ ]+).*")
             for i in range(len(erritems)):
                 line = erritems[i].strip()
                 m = pat.match(line)