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

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https://hg.mozilla.org/integration/gaia-central/rev/b3f1a9a22f1e
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #26343 from rabbihossain/master

Bug 1089604 - Implement en-GB keyboard layout.
r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/718f31b0fc44
Author: rabbihossain <me@2hr.me>
Desc: Bug 1089604 - Implement en-GB keyboard layout

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https://hg.mozilla.org/integration/gaia-central/rev/93af6a8eff74
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #26401 from dwi2/bug1094094

Bug 1094094 - [Stingray] Implement navigation and contextmenu of Apps Deck, r=rexboy7

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https://hg.mozilla.org/integration/gaia-central/rev/749f7e0b66dd
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1094094 - [Stingray] Implement navigation and contextmenu of Apps Deck
Bumping manifests a=b2g-bump