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

========

https://hg.mozilla.org/integration/gaia-central/rev/5d7303695b8d
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12999 from lightsofapollo/disable-travis-test_delete_contact.py

xfail on travis

========

https://hg.mozilla.org/integration/gaia-central/rev/f0c80187fa2b
Author: James Lal <james@lightsofapollo.com>
Desc: xfail on travis