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

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https://hg.mozilla.org/integration/gaia-2_0/rev/6434c69d89e0
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #21605 from julienw/1033472-v2.0-improve-node-modules-dependencies

a=tests
Merge pull request #21546 from julienw/1033472-improve-node-modules-depe...

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https://hg.mozilla.org/integration/gaia-2_0/rev/04eab1154cba
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #21546 from julienw/1033472-improve-node-modules-dependencies

Bug 1033472 - Gaia linter, gaia-build tests aren't using NODE_MODULES_GI...
(cherry picked from commit 10f141af83815940d1bd2b00a05c4f2e0965a0e3)
Bumping manifests a=b2g-bump