Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/3aa373970451
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #17208 from gregorwagner/tiling

Bug 972779 - [Tarako] Saving picture after editing cause Gallery stop. C...
(cherry picked from commit f3c4a2fc0cfbeccc9c595f06b436707fa2e6ca0a)

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https://hg.mozilla.org/integration/gaia-1_3/rev/c586ddaf426b
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #17197 from gtorodelvalle/v1.3-contacts-bug-972600-uplifting

Bug 972600 - [B2G][Contacts] After merging duplicate contacts selecting edit contact button brings up 'Add contact' screen

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https://hg.mozilla.org/integration/gaia-1_3/rev/820dcd11bcd7
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 972600 - [B2G][Contacts] After merging duplicate contacts selecting edit contact button brings up 'Add contact' screen
Bumping manifests a=b2g-bump