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

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https://hg.mozilla.org/integration/gaia-central/rev/91b6e108c833
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #26639 from bebef1987/fix_cost_control

Bug 1107926 - Update cost_control app object to reflect changes in Bug 1...

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https://hg.mozilla.org/integration/gaia-central/rev/405143dde9a7
Author: bebef1987 <florin.strugariu@softvision.ro>
Desc: Bug 1107926 - Update cost_control app object to reflect changes in Bug 1089968
Bumping manifests a=b2g-bump