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

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https://hg.mozilla.org/integration/gaia-2_0/rev/8b4ae9791156
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22650 from KevinGrandon/bug_1049014_to_2_dot_0

Bug 1049014 - [B2G][E.me][Search Results] Long pressing on a search result launches the app when released

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https://hg.mozilla.org/integration/gaia-2_0/rev/f51212739842
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1049014 - [B2G][E.me][Search Results] Long pressing on a search result launches the app when released r=julienw
Bumping manifests a=b2g-bump