Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/8133ee6ad8f5
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Merge pull request #13646 from bobsilverberg/bug930992

Bug 930992 - Create a System app region for app install confirmation r=zcampbell@mozilla.com

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https://hg.mozilla.org/integration/gaia-1_2/rev/88d34e260928
Author: bitgeeky <mozpankaj1994@gmail.com>
Desc: Bug 930992 - Create a System app region for app install confirmation r=zcampbell@mozilla.com