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

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https://hg.mozilla.org/integration/gaia-central/rev/52b35637844e
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19774 from azasypkin/bug-1008890-carrier-header

Bug 1008890 - [Messages] Thread carrier header is not localized correctly right after language switch. r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/d675021c9e93
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1008890 - [Messages] Thread carrier header is not localized correctly right after language switch. r=schung
Bumping manifests a=b2g-bump