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

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https://hg.mozilla.org/integration/gaia-central/rev/ab739e561a89
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #25836 from huchengtw-moz/bug-1093534-settings-app-part-2

Bug 1093534 - [Stingray][Settings] add settings list to settings app, r=dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/f342b10a533d
Author: John Hu <johu@mozilla.com>
Desc: Bug 1093534 - [Stingray][Settings] add settings list to settings app
Bumping manifests a=b2g-bump