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

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https://hg.mozilla.org/integration/gaia-central/rev/18441d7d35b6
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #19064 from bebef1987/dis_active_sync

Disable Bug 999447 - Active sync inbox seems empty in the tests on Jenki...

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https://hg.mozilla.org/integration/gaia-central/rev/0d5c250c14d8
Author: Bebe <bebe@mozilla.ro>
Desc: Disable Bug 999447 - Active sync inbox seems empty in the tests on Jenkins
Bumping manifests a=b2g-bump