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

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https://hg.mozilla.org/integration/gaia-2_1/rev/9afce645e513
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #25011 from nullaus/bug1078859

Bug 1078859 - Force getScreenshot for system browser window instances di...

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https://hg.mozilla.org/integration/gaia-2_1/rev/4c6bf4b8ddb3
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Bug 1078859 - Force getScreenshot for system browser window instances displaying a web page. r=sfoster
Bumping manifests a=b2g-bump