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

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https://hg.mozilla.org/integration/gaia-central/rev/dacd6697f0cf
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #25563 from cctuan/1050164

Bug 1050164 - Investigate to implement standalone shrinking library

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https://hg.mozilla.org/integration/gaia-central/rev/6111def19c3e
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1050164 - Investigate to implement standalone shrinking library
Bumping manifests a=b2g-bump