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

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https://hg.mozilla.org/integration/gaia-central/rev/943fc636c7e2
Author: Malini Das <thehyperballad@gmail.com>
Desc: Merge pull request #22596 from malini/runner-service-serial

Bug 1046713 - add ability to pass in serial number

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https://hg.mozilla.org/integration/gaia-central/rev/245323fdcc5d
Author: Malini Das <mdas@mozilla.com>
Desc: add ability to pass in serial number
Bumping manifests a=b2g-bump