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

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https://hg.mozilla.org/integration/gaia-central/rev/7fc7a149b809
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #24403 from yzen/bug-1069194

Bug 1069194 - added grid accessibility semantics to Calendar's month vie...

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https://hg.mozilla.org/integration/gaia-central/rev/4ae2470b35fd
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1069194 - added grid accessibility semantics to Calendar's month view. r=kgrandon
Bumping manifests a=b2g-bump