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

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https://hg.mozilla.org/integration/gaia-central/rev/4c7d9039745e
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20989 from autonome/1030316-gcli-typo

Bug 1030316 - typo in event for gcli screenshot command

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https://hg.mozilla.org/integration/gaia-central/rev/7352fc411bed
Author: Dietrich Ayala <autonome@gmail.com>
Desc: Bug 1030316 - typo in event for gcli screenshot command
Bumping manifests a=b2g-bump