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

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https://hg.mozilla.org/integration/gaia-central/rev/6ee13e4ebf6f
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19640 from pacorampas/confirmation-margins-994653

[System] no left margin at the beginning of the Confirmation prompts r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/6d0a796f87d4
Author: Paco Rampas <pacorampas@gmail.com>
Desc: [System] no left margin at the beginning of the Confirmation prompts
Bumping manifests a=b2g-bump