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

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https://hg.mozilla.org/integration/gaia-central/rev/842fd7448790
Author: Marina <mri@tid.es>
Desc: Merge pull request #24735 from gitmai/bug-1073340-CC-limit-cannot-set-to-0.07

Bug 1073340 - [Usage][Cost Control] Data usage limit can't be set to 0.0...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/4307be62cd7a
Author: mai <mri@tid.es>
Desc: Bug 1073340 - [Usage][Cost Control] Data usage limit can't be set to 0.07 GB/MB
Bumping manifests a=b2g-bump