Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/eefaf8448377
Author: Malini Das <thehyperballad@gmail.com>
Desc: Merge pull request #22793 from malini/serialfix

Bug 1052609 - only add serial for device runs

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https://hg.mozilla.org/integration/gaia-central/rev/e57cb92f0be5
Author: Malini Das <mdas@mozilla.com>
Desc: only add serial for device runs

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https://hg.mozilla.org/integration/gaia-central/rev/65df24f0592e
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #22786 from davehunt/bug1051743

Bug 1051743 - Bump marionette_client dependency to 0.8.2

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https://hg.mozilla.org/integration/gaia-central/rev/408e86de8836
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1051743 - Bump marionette_client dependency to 0.8.2. r=bsilverberg
Bumping manifests a=b2g-bump