depot_tools: update for newer pylint

Latest depot_tools supports many more pylint versions.

BUG=chromium:866772
TEST=CQ passes

Change-Id: I01334ac80c21eeda46909f917eb6b5b730315b85
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/manifest/+/1761355

Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>

full.xml

@@ -428,7 +428,7 @@ Your sources have been sync'd successfully.
     -->
   <project path="chromium/tools/depot_tools"
            name="chromium/tools/depot_tools"
-           revision="7639f1999ac1d8992fc4fbb169d164b156d9a7f7"
+           revision="84d26ae3c93d2f359972788366805f5d23996441"
            remote="chromium"
            groups="minilayout,firmware,buildtools,labtools" />
   <project path="src/chromium/src/buildtools"