Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2f9cab7d3a90
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #22709 from shamenchens/Bug1051672-TabletAppList

Bug 1051672 - Update tablet app list, r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/5cf16f9912cc
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1051672 - Update tablet app list

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https://hg.mozilla.org/integration/gaia-central/rev/f6f1bb0be7da
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #22607 from shamenchens/Bug1048711-L10NDeviceType

Bug 1048711 - L10N with device type follow up, r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/8455c476a2ea
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1048711 - L10N with device type follow up
Bumping manifests a=b2g-bump