Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/266f48443f3c
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13823 from askeing/940175

Bug 940175 - Unxfail test_setup_basic_gmail.py

========

https://hg.mozilla.org/integration/gaia-central/rev/89e0e680d0b6
Author: askeing <askeing@gmail.com>
Desc: Bug 940175 - Unxfail test_setup_basic_gmail.py