Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f7cd16c2e493
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #26839 from timdream/keyboard-dyn-build

Bug 1112460 - Keyboard build script changes to optionally preload dict, r=mnjul, gduan

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https://hg.mozilla.org/integration/gaia-central/rev/1413f521b83c
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1112460 - Part V, Create tests to verify build results of different config

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https://hg.mozilla.org/integration/gaia-central/rev/064847d36627
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1112460 - Part IV, Amend the build test to check the content of the zipped files

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https://hg.mozilla.org/integration/gaia-central/rev/5e691bb00695
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1112460 - Part III, Introduce GAIA_KEYBOARD_PRELOAD_DICT_LAYOUTS and generate config files

Bug 1112460 - Part IV, Name dictionaries with dictionaryLabel

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https://hg.mozilla.org/integration/gaia-central/rev/254e30f3022a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1112460 - Part II, Allow GAIA_KEYBOARD_LAYOUTS=*,noPreloadDictRequired

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https://hg.mozilla.org/integration/gaia-central/rev/5c206f5631d7
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1112460 - Part I, Remove v2 placeholders in keyboard build script
Bumping manifests a=b2g-bump