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

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https://hg.mozilla.org/integration/gaia-central/rev/1068528084c0
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #12620 from gitmai/bug-import-window-contact

Bug 923143 - alphabetical scrollbar overflow

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https://hg.mozilla.org/integration/gaia-central/rev/e5071e9e35a9
Author: mai <mri@tid.es>
Desc: Bug 923143 - alphabetical scrollbar overflow