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

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https://hg.mozilla.org/integration/gaia-central/rev/a1606f23faea
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #25620 from dominickuo/bug-1083129

Bug 1083129 - [System][Music] send pause command to music app when headsets are disconnected, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/cac82311880d
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1083129 - [System][Music] send pause command to music app when headsets are disconnected
Bumping manifests a=b2g-bump