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

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https://hg.mozilla.org/integration/gaia-central/rev/eba21c969aab
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20860 from rsajdok/bug#1026932

Bug 1026932: Edit button does not gray out when the folder is empty r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/4d7735a3ea82
Author: Robert Sajdok <robert.sajdok@gmail.com>
Desc: Bug 1026932 - Edit button does not gray out when the folder is empty
Bumping manifests a=b2g-bump