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

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https://hg.mozilla.org/integration/gaia-central/rev/2dd64deab505
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #22101 from etiennesegonzac/bug-1043272

Bug 1043272 - Turn on theme color by default. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/1251a7dfb3f0
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1043272 - Turn on theme color by default. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/d136867e79bc
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #22099 from etiennesegonzac/bug-1043275

Bug 1043275 - Add a meta instruction to the vertical homescreen. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9f71b6cecafe
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1043275 - Add a meta instruction to the vertical homescreen.
Bumping manifests a=b2g-bump