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

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https://hg.mozilla.org/integration/gaia-central/rev/4b524a46dbb2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23877 from KevinGrandon/bug_1054457_search_text_rows

Bug 1054457 - [Search] Visual Refinements for Rocketbar Search Results screen

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https://hg.mozilla.org/integration/gaia-central/rev/f823e8979196
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1054457 - [Search] Visual Refinements for Rocketbar Search Results screen r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/3bbf990f14c8
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #23841 from empoalp/bug_1062749

Bug 1062749 - [Dialer] Make prettyDuration use l10n attributes instead of setting textContent. r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/55b3fe0798e2
Author: David Garcia <davidg@tid.es>
Desc: Bug 1062749 - [Dialer] Make prettyDuration use l10n attributes instead of setting textContent
Bumping manifests a=b2g-bump