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

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https://hg.mozilla.org/integration/gaia-central/rev/8a154c7caaca
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #19565 from justindarc/bug1011106

Bug 1011106 - [B2G][FM Radio]User can unintentionally edge gesture swipe...

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https://hg.mozilla.org/integration/gaia-central/rev/3543fad91de2
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1011106 - [B2G][FM Radio]User can unintentionally edge gesture swipe while changing radio stations
Bumping manifests a=b2g-bump