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

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https://hg.mozilla.org/integration/gaia-central/rev/19da5eeb05d8
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #23292 from sangpire/Bug1057307

Bug 1057307 - Can't type Korean 중성(CHUNG SUNG) character, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e1a12fff3bdf
Author: sangpire <sangpire@gmail.com>
Desc: Bug 1057307 - Can't type korean 중성(CHUNG SUNG) character.

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https://hg.mozilla.org/integration/gaia-central/rev/ca76cea1d2a0
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22976 from yurenju/regex

Bug 1053834 - Wrong regular expressions in build/shared-utils.js and build/webapp-shared.js r=gduan

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https://hg.mozilla.org/integration/gaia-central/rev/cab483dbd5d0
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1053834 - Wrong regular expressions in build/shared-utils.js and build/webapp-shared.js r=gduan
Bumping manifests a=b2g-bump