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

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https://hg.mozilla.org/integration/gaia-central/rev/f0711dcb4c9e
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #15753 from steveck-chung/bug-961950

Bug 961950 - Replace message edit button with option menu contains delete / settings option

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https://hg.mozilla.org/integration/gaia-central/rev/9a59116ca6ee
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 961950 - Replace message edit button with option menu contains delete / settings option
Bumping manifests a=b2g-bump