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

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https://hg.mozilla.org/integration/gaia-central/rev/889f661704b9
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #22369 from pivanov/bug-1035687-followup

Bug 1035687 - [SMS] - check missing images | followup

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https://hg.mozilla.org/integration/gaia-central/rev/c4fb2fda894a
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035687 - [SMS] - check missing images | followup
Bumping manifests a=b2g-bump