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

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https://hg.mozilla.org/integration/gaia-2_1/rev/ac3f6f87ca26
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #24234 from davidflanagan/bug1070195-v2.1

Bug 1070195: free canvas memory after creating a video poster image in Camera r=wilsonpage

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https://hg.mozilla.org/integration/gaia-2_1/rev/0ceb7fb0200b
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1070195: free canvas memory after creating a video poster image in Camera app
(cherry picked from commit 89b12d200ba8e19d843f93c5da444e6a835c839d)
Bumping manifests a=b2g-bump