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

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https://hg.mozilla.org/integration/gaia-central/rev/ff4361871ef2
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #23570 from azasypkin/bug-1061150-outgoing-message-background

Bug 1061150 - [Messages][Refresh] Change outgoing message background to #fff. r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/245909c17c77
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1061150 - [Messages][Refresh] Change outgoing message background to #fff. r=schung
Bumping manifests a=b2g-bump