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

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https://hg.mozilla.org/integration/gaia-2_1/rev/71071cca5a73
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #25242 from sfoster/aus-bug-1081321

bug 1081321 - Do not wait to screenshot browser windows. r=etienne, a=fabrice

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https://hg.mozilla.org/integration/gaia-2_1/rev/a143f94bca1f
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1081321 - Do not wait more than 400ms for screenshot, do not wait for browser window screenshots. r=etienne
Bumping manifests a=b2g-bump