Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/ddd8307c9252
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #14662 from mcav/autoconfig-xhr-1.3

Bug 942795 - [email] autoconfig XHR callbacks seem to be firing multiple times on nightly. r=asuth a=fabrice

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https://hg.mozilla.org/integration/gaia-1_3/rev/37e890510d1b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 942795 - [email] autoconfig XHR callbacks seem to be firing multiple times on nightly. r=asuth a=fabrice