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

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https://hg.mozilla.org/integration/gaia-central/rev/4dbb8c044590
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23027 from crdlc/bug-1047276

Bug 1047276 - [Vertical Home-screen] Change in position of smart collect...

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https://hg.mozilla.org/integration/gaia-central/rev/77c25b87768c
Author: crdlc <crdlc@tid.es>
Desc: Bug 1047276 - [Vertical Home-screen] Change in position of smart collections in default-Homescreen json doesnt reflect on screen
Bumping manifests a=b2g-bump