Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/33a955c63480
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12789 from viorelaioia/bug-924946

Bug 924946 - Change test_ftu_with_tour so it can work on desktopb2g

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https://hg.mozilla.org/integration/gaia-central/rev/823db7efd3b4
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 924946 - Change test_ftu_with_tour so it can work on desktopb2g

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https://hg.mozilla.org/integration/gaia-central/rev/3b4223fc6fa9
Author: Gabriele Svelto <gabriele.svelto@gmail.com>
Desc: Bug 915074 - Adjust the text size to make it entirely visible r=etienne