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

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https://hg.mozilla.org/integration/gaia-central/rev/da6109b189d1
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #18075 from lissyx/bug989876

Bug 989876 - Setting installTime and updateTime fields r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/7dc4a33c157f
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 989876 - Setting installTime and updateTime fields
Bumping manifests a=b2g-bump