Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/7633f9daf3f6
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #10998 from ian-liu/clock/Bug894239_Update_icon_which_be_provide_via_UX_team_for_assets_@1.5

Bug 894239 - [Clock] Update icon which be provide via UX team for assets @1.5, r=@rexboy7

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https://hg.mozilla.org/integration/gaia-central/rev/edf26a4dcf74
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 894239 - [Clock] Update icon which be provide via UX team for assets @1.5