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

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https://hg.mozilla.org/integration/gaia-central/rev/123b5041f9ed
Author: Askeing Yen (fyen) <askeing@gmail.com>
Desc: Merge pull request #14323 from zacc/bug_945792

Bug 945792 - xfail test_sms_with_attachments because of bug 945774 r=Ask...

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https://hg.mozilla.org/integration/gaia-central/rev/54fbf9bdec99
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 945792 - xfail test_sms_with_attachments because of bug 945774 r=Askeing