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

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https://hg.mozilla.org/integration/gaia-central/rev/8d0d97810e7f
Author: gitmai <mri@tid.es>
Desc: Merge pull request #20894 from gitmai/bug-995291-add-unit-test

Bug 995291 -[CostControl] Add unit test
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/5cfc6339ffc3
Author: mai <mri@tid.es>
Desc: Bug 995291 -[CostControl] Add unit test
Bumping manifests a=b2g-bump