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

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https://hg.mozilla.org/integration/gaia-central/rev/e3d8d481edae
Author: Michał Budzyński <michal@virtualdesign.pl>
Desc: Merge pull request #18938 from michalbe/Bug969393

Bug 969393 - Import contacts from SD Card

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https://hg.mozilla.org/integration/gaia-central/rev/c5e6276f2452
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: Bug 969393 - Import contacts from SD Card When "Default media location" is not 'SD Card'
Bumping manifests a=b2g-bump