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

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https://hg.mozilla.org/integration/gaia-central/rev/f75265896a0f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #20267 from pacorampas/delete-button-moved-1020744

Bug 1020744 - [Dialer][Flame] Enter more than 19 digits in dialer, back delete button moved couple pixels to the left

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https://hg.mozilla.org/integration/gaia-central/rev/e015e540c38b
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1020744 - [Dialer][Flame] Enter more than 19 digits in dialer, back delete button moved couple pixels to the left
Bumping manifests a=b2g-bump