Bumping gaia.json for 3 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/4b96c1b7f7e6
Author: vingtetun <21@vingtetun.org>
Desc: Bug 967880 - [Call Log] Background doesn't scroll with the logs causing expensive over-invalidation. r=etienne,bgirard

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https://hg.mozilla.org/integration/gaia-1_3/rev/b329690b7cbd
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #15998 from vingtetun/bug967274

Bug 967274 - [Contacts] Background doesn't scroll with the contacts caus...

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https://hg.mozilla.org/integration/gaia-1_3/rev/a5619a7fbc01
Author: vingtetun <21@vingtetun.org>
Desc: Bug 967878 - [Messages] Background doesn't scroll with the threads causing expensive over-invalidation. r=felash,bgirard