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

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https://hg.mozilla.org/integration/gaia-central/rev/71c9e718056a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24303 from KevinGrandon/bug_1071184_shut_up_system

Bug 1071184 - Log less junk

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https://hg.mozilla.org/integration/gaia-central/rev/ed5e8e526590
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1071184 - Log less junk r=kgrandon
Bumping manifests a=b2g-bump