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

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https://hg.mozilla.org/integration/gaia-central/rev/a7a129e7b9cb
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #22481 from ferjm/bug1044060.mobileiduitest

Bug 1044060 - [MobileID] Add Mobile ID test to Gaia UI test app. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e8e9a74dc5ae
Author: Fernando Jiménez <ferjmoreno@gmail.com>
Desc: Bug 1044060 - [MobileID] Add Mobile ID test to Gaia UI test app. r=timdream
Bumping manifests a=b2g-bump