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

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https://hg.mozilla.org/integration/gaia-central/rev/f40010ddb9b8
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #20556 from mcjimenez/bug1020158

Bug 1020158 - Send IAC message to start the population process (r = fcampo)

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https://hg.mozilla.org/integration/gaia-central/rev/99d7d69871cf
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1020158 - Send IAC message to start the population process
Bumping manifests a=b2g-bump