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

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https://hg.mozilla.org/integration/gaia-central/rev/ce8a3127a318
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #25350 from yzen/bug-1084551

 Bug 1084551 - made calendar list accessible in calendar settings. r=mmedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/54f416ff818d
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1084551 - made calendar list accessible in calendar settings. r=mmedeiros
Bumping manifests a=b2g-bump