Update the regex used for searching for ETag's in gsutil's output
Update the regex used for searching for ETag's in gsutil's output

The ETag's for some of the crx files contain non alpha
and non digit characters like '='.

Bug:1225491
Bug:b/191630810
Change-Id: Id43ed8ea5fc17825731dd1605c7d6358ceed39cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3287293
Reviewed-by: Gavin Mak <bdcbd10822f2f5deecea3bf14d73e9025b1b8375@google.com>
Commit-Queue: Rakib Hasan <b8c940cea6e1ecbd15dc8d7e22b88b8c22a457f7@google.com>

CoherentLabs/depot_tools,CoherentLabs/depot_tools