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

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https://hg.mozilla.org/integration/gaia-2_1/rev/7451436b3933
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #26797 from nullaus/v2.1

Merge pull request #26646 from nullaus/bug1100842

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https://hg.mozilla.org/integration/gaia-2_1/rev/daaf8fa2a19a
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #26646 from nullaus/bug1100842

bug 1100842 - Use solid color for dialog background like all other dialo...
(cherry picked from commit 1d9ae9cca415ad093beba9521c429350e1f2b14d)
Bumping manifests a=b2g-bump