Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b66e66ad4505
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 1109240 - remove use of unsolicited callbacks from Camera app"

This reverts commit e6be133f4c7719bcbd224496f85fadb6bdc30803.
Bumping manifests a=b2g-bump