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

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https://hg.mozilla.org/integration/gaia-central/rev/e507507df0d5
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26322 from huchengtw-moz/bug-1102142-circle-button

Bug 1102142 - [Stingray][home] create circle-button and use it in Home's..., r=dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/bf6fc9e1fa16
Author: John Hu <johu@mozilla.com>
Desc: Bug 1102142 - [Stingray][home] create circle-button and use it in Home's search button
Bumping manifests a=b2g-bump