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/74b010561014
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15953 from bobsilverberg/mms_timeout

Bug 964233 - [v1.3] Increase timeout when waiting for mms with attachmen...

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https://hg.mozilla.org/integration/gaia-1_3/rev/62c575a9978c
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 964233 - [v1.3] Increase timeout when waiting for mms with attachment to be sent