Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/24d006bbcacd
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21933 from nullaus/v2.0

V2.0

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https://hg.mozilla.org/integration/gaia-2_0/rev/e301405ac912
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21932 from nullaus/bug1038167

bug 1038167 - Add 84x84 icons.
(cherry picked from commit 163a63012cdae5c6f77e5bba81a51ab35ac2cf32)

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https://hg.mozilla.org/integration/gaia-2_0/rev/d4d2115895f1
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21931 from nullaus/bug1038167

bug 1038167 - Remove 80x80, 256x256. Add 84x84. Update System to correct...
(cherry picked from commit 3c2e98b35cd1f50e55be1c374ff460d9244c9514)
Bumping manifests a=b2g-bump