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

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https://hg.mozilla.org/integration/gaia-central/rev/5a6114a57fb1
Author: gitmai <mri@tid.es>
Desc: Merge pull request #15139 from gitmai/bug-950009-Appear-Balance-options-on-settings

Bug 950009 - [Costcontrol] Appear Balance options during some seconds wh...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/5530a44ea10e
Author: mai <mri@tid.es>
Desc: Bug 950009 - [Costcontrol] Appear Balance options during some seconds when I press any options of 'Reset data usage'