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

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https://hg.mozilla.org/integration/gaia-central/rev/8e37e691df5e
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Merge pull request #24089 from acperez/bug-1067860

Bug 1067860 - Throw error if keys of properties does not contain 'keyboard.' in keyboard sv json.

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https://hg.mozilla.org/integration/gaia-central/rev/53497acf7e53
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Bug 1067860 - Throw error if keys of properties does not contain 'keyboard.' in keyboard sv json.
Bumping manifests a=b2g-bump