depot_tools: roll for Python 3 fixes

BUG=chromium:997354
TEST=`./run_tests` passes

Change-Id: I836fca2c92c5e396db5999f264e961a0d0fdbd8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/manifest/+/1945893Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>

full.xml

@@ -445,7 +445,7 @@ Your sources have been sync'd successfully.
     -->
   <project path="src/chromium/depot_tools"
            name="chromium/tools/depot_tools"
-           revision="3841eaa164c2f34c8ea969d462a3151b10151780"
+           revision="5ae4817ada0bd02f8c0d9f141d0f3c65701068a5"
            remote="chromium"
            groups="minilayout,firmware,buildtools,labtools" />
   <project path="src/chromium/src/buildtools"