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

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https://hg.mozilla.org/integration/gaia-2_1/rev/a0d959a94b19
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #23654 from nullaus/v2.1

Merge pull request #23441 from nullaus/bug1058722

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https://hg.mozilla.org/integration/gaia-2_1/rev/ab056df2aa44
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #23441 from nullaus/bug1058722

bug 1058722 - Add ability to filter stack when invoking the task manager...
(cherry picked from commit 472804d7de2797e87fb4cceb32d51aa1cfc10d6f)
Bumping manifests a=b2g-bump