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

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https://hg.mozilla.org/integration/gaia-central/rev/7a7bf3cdf605
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #25767 from pacorampas/1069836

Bug 1069836 - [Dialer][Call Screen] Improve the localizantion of call options in call screen (follow up of 977588) r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/b308282aac06
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1069836 - [Dialer][Call Screen] Improve the localizantion of call options in call screen (follow up of 977588)
Bumping manifests a=b2g-bump