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

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https://hg.mozilla.org/integration/gaia-central/rev/e86435253b1f
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #17888 from rnowm/991006

Bug 963019 - [Building Blocks] [Refresh] Update styles of 'List' component r=joan

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https://hg.mozilla.org/integration/gaia-central/rev/341c3d874808
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 963019 - [Building Blocks] [Refresh] Update styles of 'List' component
Bumping manifests a=b2g-bump