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

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https://hg.mozilla.org/integration/gaia-central/rev/69ecaaa2c4a7
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #18414 from dominickuo/bug-997360

Bug 997360 - [Music] skip the audio channel test for tpbl

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https://hg.mozilla.org/integration/gaia-central/rev/8dfd590d5b8c
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 997360 - [Music] skip the audio channel test for tpbl
Bumping manifests a=b2g-bump