Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/de04182f80ad
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #15360 from rnowm/951130

Bug 951130 - Contacts Export view is visually incorrect

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https://hg.mozilla.org/integration/gaia-1_3/rev/e8451bf0927f
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #14918 from EverythingMe/941637-eme-aria

Bug 941637 - App icons don't have alt text so screen readers can't read ...