fix(prepare-travis): Always use JSON output of the yarn workspaces command #7119
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What it does
With yarn v1.22.0 the output is not rendered in JSON when it's the last parameter
Fixes #7118
How to test
bump to yarn v1.22.0
Review checklist
Reminder for reviewers
Change-Id: I98a0d59a98e3e3226cbc242c1a5e264aaa6fd607
Signed-off-by: Florent Benoit [email protected]