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

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https://hg.mozilla.org/integration/gaia-2_1/rev/bdfb4277b182
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #25541 from chirarobert/uplift_audio

Bug 1011000 - Enable audio channel change Gaia UI Tests checking

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https://hg.mozilla.org/integration/gaia-2_1/rev/875593d70499
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1011000 - Enable audio channel change Gaia UI Tests checking
Bumping manifests a=b2g-bump