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

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https://hg.mozilla.org/integration/gaia-central/rev/46a1fad2831b
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19481 from rnowm/1013952

Bug 1013952 - [VR] migrate style_unstable buttons and inputs [BB] to style folder r=21

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https://hg.mozilla.org/integration/gaia-central/rev/61dceadc23f9
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1013952 - [VR] migrate style_unstable buttons and inputs [BB] to style folder
Bumping manifests a=b2g-bump