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

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https://hg.mozilla.org/integration/gaia-central/rev/5b75ae2d8a79
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #22060 from viorelaioia/bug_1042530

Bug 1042530 - Update wait in test_settings_root

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https://hg.mozilla.org/integration/gaia-central/rev/4ae0476ef19d
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1042530 - Update wait in test_settings_root
Bumping manifests a=b2g-bump