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

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https://hg.mozilla.org/integration/gaia-central/rev/f4c0db6cc208
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #18925 from askeing/1005789

Bug 1005789 - Re-enable test_gallery_flick

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https://hg.mozilla.org/integration/gaia-central/rev/862b3e775cca
Author: askeing <askeing@gmail.com>
Desc: Bug 1005789 - Re-enable test_gallery_flick
Bumping manifests a=b2g-bump