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

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https://hg.mozilla.org/integration/gaia-central/rev/8f2b2d0f56f6
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19062 from pacorampas/emergency-call-992915

Bug 992915 - [Emergency-call] Emergency call main dialer screen (keypad) visual refresh 2.0 r=me

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https://hg.mozilla.org/integration/gaia-central/rev/26d806f535b9
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 992915 - [Emergency-call] Emergency call main dialer screen (keypad) visual refresh 2.0
Bumping manifests a=b2g-bump