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

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https://hg.mozilla.org/integration/gaia-central/rev/aa27f131a40f
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #24282 from julienw/1070918-dialer-test

Bug 1070918 - [Dialer] Intermittent failure with newer mocha r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/e7f26b3e6e73
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1070918 - [Dialer] Intermittent failure with newer mocha r=rik
Bumping manifests a=b2g-bump