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

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https://hg.mozilla.org/integration/gaia-central/rev/899748204da9
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #25159 from crh0716/1071366

Bug 1071366 - Add the missed case of erasing call forwarding settings r=jaoo

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https://hg.mozilla.org/integration/gaia-central/rev/4aa05dba0080
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1071366 - Add the missed case of erasing call forwarding settings
Bumping manifests a=b2g-bump