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

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https://hg.mozilla.org/integration/gaia-2_0/rev/1acc184c73ae
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #20928 from AndreiH/bug_1028906

Bug 1028906 - [v2.0][v2.1] Marketplace launch test is failing at "set_pe...

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https://hg.mozilla.org/integration/gaia-2_0/rev/ff806d0f7027
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 1028906 - [v2.0][v2.1] Marketplace launch test is failing at "set_permission('Homescreen', 'geolocation', 'deny')"
Bumping manifests a=b2g-bump