Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e8fced101cb7
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #14944 from kumarrishav/issue-944284

Bug 944284 [UITEST] add dial number activity , styling issue fixed- bug ..., r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/931a6be5195c
Author: kumarrishav <reactiverishav007@gmail.com>
Desc: identation issue removed

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https://hg.mozilla.org/integration/gaia-central/rev/21fc43d8336c
Author: kumarrishav <reactiverishav007@gmail.com>
Desc: Bug 944284 [UITEST] add dial number activity , styling issue fixed- bug fixed