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

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https://hg.mozilla.org/integration/gaia-central/rev/0c8b8bcb4829
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #16671 from zacc/bug_977118

Bug 977118 - Remove switch_to_ftu from test_cost_control_ftu r=andreih

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https://hg.mozilla.org/integration/gaia-central/rev/a8092e7424c0
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 977118 - Remove switch_to_ftu from test_cost_control_ftu r=andreih
Bumping manifests a=b2g-bump