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

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https://hg.mozilla.org/integration/gaia-central/rev/aa23c1312bd2
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #23698 from cctuan/1061563

Bug 1061563 - extend build test time

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https://hg.mozilla.org/integration/gaia-central/rev/574e7fdeacab
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1061563 - extent test timeout from 180000 for build-test
Bumping manifests a=b2g-bump