[lacros skew tests] Refresh skew tests for M125

This CL updates the ash version ['125.0.6390.0'] for Lacros version skew testing.
This cl only affect linux-lacros config builders like
linux-lacros-tester-rel, linux-lacros-rel.
This cl will certainly NOT affect Lacros on-device builders
(lacros-amd64-generic-rel, lacros-amd64-generic-chrome-skylab,
etc) or any other platforms.

If this CL caused regressions, please revert and stop the autoroller
at https://luci-scheduler.appspot.com/jobs/chrome/lacros-version-skew-roller
Also please file a bug to OS>LaCrOS>Partner, and CC kuanhuang@chromium.org.

R=rubber-stamper@appspot.gserviceaccount.com

Bug: None
Change-Id: I400bea1fac8e04299a8a854691f8ba7106c087fd
Requires-Testing: True
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5406759
Auto-Submit: chrome-weblayer-builder <chrome-weblayer-builder@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1280578}