Update pywin32 in the vpython file to 227

Change-Id: Ie44434f04b903ed4ae66098be3ac7d8ebfccf3d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163434Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Chan Li <chanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762087}

.vpython

@@ -371,7 +371,7 @@ wheel: <
 #   //third_party/blink/tools/blinkpy/web_tests/port/server_process.py
 wheel: <
   name: "infra/python/wheels/pywin32/${vpython_platform}"
-  version: "version:224"
+  version: "version:227"
   match_tag: <
     platform: "win32"
   >