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

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https://hg.mozilla.org/integration/gaia-1_4/rev/56cdc798cc32
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #20018 from AndreiH/bug_1020298

Bug 1020298 - "Add videos to get started" message is shown when opening Video app

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https://hg.mozilla.org/integration/gaia-1_4/rev/5aeab0b7ba49
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 1020298 - "Add videos to get started" message is shown when opening Video app
Bumping manifests a=b2g-bump