Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1d578a3ff4da
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12618 from AndreiH/unxfail_marketplace_add_review

Bug 923096 - Unxfail test_marketplace_add_review

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https://hg.mozilla.org/integration/gaia-central/rev/3a3c3721e58f
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Unxfail test marketplace can add review

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https://hg.mozilla.org/integration/gaia-central/rev/a0e75f210f68
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12564 from gitmai/bug-880775-birthday-timezone

Bug 880775 - Birthday timezone error

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https://hg.mozilla.org/integration/gaia-central/rev/6c6a42240f81
Author: mai <mri@tid.es>
Desc: Bug 880775 - Birthday timezone error