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

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https://hg.mozilla.org/integration/gaia-central/rev/75c6f8d7976d
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #14573 from vingtetun/bug948396

Bug 948396 - [Calendar] Can not scroll anymore the week/day view once th...

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https://hg.mozilla.org/integration/gaia-central/rev/5014dedccfd9
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 948396 - [Calendar] Can not scroll anymore the week/day view once the new event has been opened with APZ turned on. r=kgrandon