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

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https://hg.mozilla.org/integration/gaia-central/rev/c4b69393794b
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #21817 from rnowm/1036147

Bug 1036147 - [B2G][Gaia] Lengthy button text does not wrap to second line in 2.0 causing truncation in multiple locations for multiple languages r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/6a9fe50a29de
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1036147 - [B2G][Gaia] Lengthy button text does not wrap to second line in 2.0 causing truncation in multiple locations for multiple languages
Bumping manifests a=b2g-bump