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

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https://hg.mozilla.org/integration/gaia-central/rev/4e2a12df2731
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #18038 from rnowm/992863

Bug 992863 - [BB] update Input focus state r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/e81dc47a2496
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 992863 - [BB] update Input focus state
Bumping manifests a=b2g-bump