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

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https://hg.mozilla.org/integration/gaia-central/rev/869eadff4bf0
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #26001 from pacorampas/1094746

Bug 1094746 - [Dialer][Call Screen] Remove horizontal line at the bottom of a conference participant list overlay of a conference participant list overlay. r=gtorodelvalle

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https://hg.mozilla.org/integration/gaia-central/rev/9ef175edfc67
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1094746 - [Dialer][Call Screen] Remove horizontal line at the bottom of a conference participant list overlay
Bumping manifests a=b2g-bump