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

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https://hg.mozilla.org/integration/gaia-central/rev/4fa94c036e1c
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #26967 from albertopq/1095677-attention-tray

Bug 1095677 - Activating utility tray on attention screen r=alive +autolander

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https://hg.mozilla.org/integration/gaia-central/rev/311b51f12a27
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1095677 - Activating utility tray on attention screen
Bumping manifests a=b2g-bump