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

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https://hg.mozilla.org/integration/gaia-1_4/rev/8af8bd1fb902
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #17764 from nullaus/v1.4

V1.4

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https://hg.mozilla.org/integration/gaia-1_4/rev/4ab15038c7b3
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #17607 from nullaus/bug981764

bug 981764
Bumping manifests a=b2g-bump