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

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https://hg.mozilla.org/integration/gaia-central/rev/aec77849009d
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #16053 from vingtetun/bug967277.followup

Bug 967277 - [Contacts] Scrolling the contacts app causes reflow. Follow...

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https://hg.mozilla.org/integration/gaia-central/rev/70d6a097d73e
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 967277 - [Contacts] Scrolling the contacts app causes reflow. Followup. r=arcturus
Bumping manifests a=b2g-bump