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

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https://hg.mozilla.org/integration/gaia-2_0/rev/1d13c3fa180d
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #22543 from jimporter/ringtones-mimetype

Bug 1045186 - [B2G][Ringtones] The user can not share ringtone through MMS

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https://hg.mozilla.org/integration/gaia-2_0/rev/a6a538b74690
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #18926 from dominickuo/bug-998906

Bug 998906 - [Music] display the correct overlay after the enumeration in ListView, r=jimporter
Bumping manifests a=b2g-bump