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

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https://hg.mozilla.org/integration/gaia-central/rev/6adeb4ce3a0b
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #19566 from pivanov/bug-1011696

Bug 1011696 - [Flame][Contacts] - Fuzzy images

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https://hg.mozilla.org/integration/gaia-central/rev/17e0a221a4e1
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1011696 - [Flame][Contacts] - Fuzzy images

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https://hg.mozilla.org/integration/gaia-central/rev/f74f89309f88
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #19562 from yzen/bug-1014770

Bug 1014770 - added necessary aria attributes to utility tray quick sett...

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https://hg.mozilla.org/integration/gaia-central/rev/47ecfa3ca8a8
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1014770 - added necessary aria attributes to utility tray quick settings. r=alive
Bumping manifests a=b2g-bump