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

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https://hg.mozilla.org/integration/gaia-1_4/rev/c43be06040ea
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #23007 from nullaus/v1.4

Merge pull request #22945 from nullaus/bug1053509

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https://hg.mozilla.org/integration/gaia-1_4/rev/312492aa61c5
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #22945 from nullaus/bug1053509

bug 1053509 - Use plain js download object when download succeeds. r=crd...
(cherry picked from commit 385f8b1fc9179441c9d6a6ad16ff8701edfa1faa)
Bumping manifests a=b2g-bump