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/4b6a57482685
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #15069 from viorelaioia/bug_957118

Bug 957118 - [v1.3] Unxfail tests on v1.3

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https://hg.mozilla.org/integration/gaia-1_3/rev/08b485234431
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 957118 - [v1.3] Unxfail tests on v1.3