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

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https://hg.mozilla.org/integration/gaia-central/rev/ca767203512a
Author: Eli Perelman <eli@eliperelman.com>
Desc: Merge pull request #26899 from eliperelman/bug-1088118-calendar

Bug 1088118 - Adding User Timing markers to Calendar

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https://hg.mozilla.org/integration/gaia-central/rev/c4ac85438d01
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1088118 - Adding User Timing markers to Calendar
Bumping manifests a=b2g-bump