Roll eche_app from _e-_QwxVx-avJW-8-... to Z2J2ltyvCyRojQYpg...

Release_Notes: http://go/eche-x20/relnotes/Main/eche_20240819_RC00.html

https://chrome-infra-packages.appspot.com/p/chromeos_internal/apps/eche_app/app/+/Z2J2ltyvCyRojQYpgDBm2j7-vi_s-6GzPqngmUzJeXsC

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://skia-autoroll.corp.goog/r/eche-app-chromium
Please CC christyfranks@google.com,dnishi@google.com,eche-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://issues.skia.org/issues/new?component=1389291&template=1850622

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

Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Bug: None
Tbr: eche-app@grotations.appspotmail.com
Change-Id: I966388ee9c8ec1e47acf74152bcfaecfb402a0e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5798701
Bot-Commit: 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/main@{#1343909}