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

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https://hg.mozilla.org/integration/gaia-central/rev/ae0cb526d985
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #15055 from yzen/957026

Bug 957026 - fixed the screen reader visibility for the search-bar. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/32313fbee12a
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Bug 957026 - fixed the screen reader visibility for the search-bar.