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

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https://hg.mozilla.org/integration/gaia-central/rev/f9552af54d2f
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #23142 from shamenchens/Bug1041313-SettingsButtons

Bug 1041313 - Update css for settings buttons, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/52fecca226bb
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Bug 1041313 - Update css for settings buttons
Bumping manifests a=b2g-bump