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

========

https://hg.mozilla.org/integration/gaia-central/rev/6e8e72a03d36
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21648 from vingtetun/bug1028533

Bug 1028533 - Check hwSupportedTypes exists. r=vingtetun

========

https://hg.mozilla.org/integration/gaia-central/rev/f272a038bc85
Author: Camel Aissani <camel.aissani@nuageprive.fr>
Desc: Bug 1028533 - Check hwSupportedTypes exists. r=vingtetun
Bumping manifests a=b2g-bump