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

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https://hg.mozilla.org/integration/gaia-central/rev/5144d0c0c26f
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #17221 from mihai/bug_937509

Bug 937509 - [Settings] Fix bluetooth confirmation prompt text case. r=@crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/c7a3f18ef540
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 937509 - [Settings] Fix bluetooth confirmation prompt text case. r=arthurcc
Bumping manifests a=b2g-bump