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

========

https://hg.mozilla.org/integration/gaia-central/rev/8b0bebc9fe09
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #16626 from fcampo/fix-ftu-email-scroll

Bug 969230 - [FTE] Email address field is covered by keyboard in about B2G OS page (r=arcturus)

========

https://hg.mozilla.org/integration/gaia-central/rev/8e35de08a128
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 969230 - [FTE] Email address field is covered by keyboard in about B2G OS page
Bumping manifests a=b2g-bump