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

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https://hg.mozilla.org/integration/gaia-1_4/rev/9a7cb1a39689
Author: Wil Clouser <clouserw@gmail.com>
Desc: Merge pull request #26207 from clouserw/1083528.3

Bug 1083528 - Add dev/stage Marketplaces to 1.4. r=fabrice

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https://hg.mozilla.org/integration/gaia-1_4/rev/337f450e6136
Author: Wil Clouser <clouserw@gmail.com>
Desc: Bug 1083528 - Add dev/stage Marketplaces to 1.4
Bumping manifests a=b2g-bump