Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/eb57679e333c
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14319 from AndreiH/bug945227_v1.2

Bug 945227 - tap_back_from_import_contacts needs a stronger wait r=me

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https://hg.mozilla.org/integration/gaia-1_2/rev/418e889493c5
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 945227 - tap_back_from_import_contacts needs a stronger wait r=me