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

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https://hg.mozilla.org/integration/gaia-central/rev/96e196683611
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #16181 from fabi1cazenave/l10nEscape-bug970255

Bug 970255 - escape $ signs in l10n arguments

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https://hg.mozilla.org/integration/gaia-central/rev/221db832bab3
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Bug 970255 - escape $ signs in l10n arguments
Bumping manifests a=b2g-bump