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

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https://hg.mozilla.org/integration/gaia-1_4/rev/a95dd3553e78
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #21692 from dominickuo/bug-1032638

Bug 1032638 - [Music] Ignore the MP4 files with not enough metadata, r=jimporter
Bumping manifests a=b2g-bump