Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/e426a7d69801
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #20504 from jimporter/ringtones-hide-share-from-self

Bug 1015513 - [ringtones] An app shouldn't be able to pick itself when l...
Bumping manifests a=b2g-bump