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

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https://hg.mozilla.org/integration/gaia-central/rev/f76c9dc32e9e
Author: gitmai <mri@tid.es>
Desc: Merge pull request #17022 from gitmai/bug-980672-error-deactivating-limit-picker

Bug 980672 - [B2G][Cost Control] Disabling Data use alert does not deact...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/c3e4ea138b03
Author: mai <mri@tid.es>
Desc: Bug 980672 - [B2G][Cost Control] Disabling Data use alert does not deactivate Limit picker
Bumping manifests a=b2g-bump