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

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https://hg.mozilla.org/integration/gaia-central/rev/992ef59a3122
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #23530 from arcturus/bug-1043496

Bug 1043496 - Default Image for Contacts When Image is Missing | followup r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/aba1330debaf
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1043496 - Default Image for Contacts When Image is Missing | followup r=arcturus
Bumping manifests a=b2g-bump