Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4dbcd882fb48
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #24259 from azasypkin/bug-1014686-template-refactoring

Bug 1014686 - [Messages][Refactoring] Improve "html template string" to "dom node\fragment" conversion. Added Template.prepare method. r=djf, julien

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https://hg.mozilla.org/integration/gaia-central/rev/43f8b8d9d92c
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1014686 - [Messages][Refactoring] Improve "html template string" to "dom node\fragment" conversion. Added Template.prepare method. r=djf, julien
Bumping manifests a=b2g-bump