Roll Help App from BrzlGtpSj... to iymm0X4k8...

Release_Notes: http://go/help_app-x20/relnotes/Main/help_app_nightly_202101080600_RC00.html

https://chrome-infra-packages.appspot.com/p/chromeos_internal/apps/help_app/app/+/iymm0X4k86dP1qOJ7zLR6r45tSnluDcJ8ticed31c9wC

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://skia-autoroll.corp.goog/r/help-app-chromium-autoroll
Please CC help-app@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Bug: b/159081758,b/170162419,b/174321021,b/177025051
Tbr: help-app@grotations.appspotmail.com
Change-Id: I878f8f84e7a20449c4f9c596413eb4976e414280
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616812Reviewed-by: chromium-internal-autoroll <chromium-internal-autoroll@skia-corp.google.com.iam.gserviceaccount.com>
Commit-Queue: chromium-internal-autoroll <chromium-internal-autoroll@skia-corp.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#841521}

DEPS

@@ -1598,7 +1598,7 @@ deps = {
     'packages': [
       {
         'package': 'chromeos_internal/apps/help_app/app',
-        'version': 'BrzlGtpSjp8quKJlBN8pxLiY0XfrgeDpvKGKAovPBTIC',
+        'version': 'iymm0X4k86dP1qOJ7zLR6r45tSnluDcJ8ticed31c9wC',
       },
     ],
     'condition': 'checkout_chromeos and checkout_src_internal',