WP CLI commands strip quotes

[cliffordp]

slic site-cli i18n make-pot . languages/tk-automatewoo-pluginhive-bookings.pot --headers='{"Report-Msgid-Bugs-To":"https://github.com/cliffordp/tk-automatewoo-pluginhive-bookings/issues"}'

And causes a PHP notice at https://github.com/wp-cli/i18n-command/blob/v2.4.1/src/MakePotCommand.php#L969

Warning: Invalid argument supplied for foreach()

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