Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d39431f7b119
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #23934 from evanxd/bug-1043408

Bug 1043408 - Use marionette-apps version 0.3.9 r=me

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https://hg.mozilla.org/integration/gaia-central/rev/434342da07f5
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1043408 - Use marionette-apps version 0.3.9

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https://hg.mozilla.org/integration/gaia-central/rev/9be35cc0560b
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #23892 from evanxd/bug-1061135

Bug 1061135 - Re-enable the tests r=me

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https://hg.mozilla.org/integration/gaia-central/rev/129207ca7583
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1061135 - Re-enable the tests
Bumping manifests a=b2g-bump