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

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https://hg.mozilla.org/integration/gaia-central/rev/82de2a1520ba
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19768 from rnowm/1017592

Bug 1017592 - [gaia-tabs] add styles to underline only selected text in a tab r=wilsonpage

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https://hg.mozilla.org/integration/gaia-central/rev/a8379cca3509
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1017592 - [gaia-tabs] add styles to underline only selected text in a tab
Bumping manifests a=b2g-bump