shipit_code_coverage: Update grcov to version 0.1.12
shipit_code_coverage: Update grcov to version 0.1.12

srfraser/services,mozilla-releng/services,lundjordan/services,srfraser/services,garbas/mozilla-releng-services,La0/mozilla-relengapi,lundjordan/services,mozilla-releng/services,lundjordan/services,mozilla-releng/services,lundjordan/services,La0/mozilla-relengapi,garbas/mozilla-releng-services,srfraser/services,La0/mozilla-relengapi,srfraser/services,garbas/mozilla-releng-services,mozilla-releng/services,La0/mozilla-relengapi,garbas/mozilla-releng-services