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

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https://hg.mozilla.org/integration/gaia-central/rev/6f2c5ebccf01
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #19970 from jimporter/ringtone-share-fix-alignment

Bug 1018322 - [ringtones] Fix alignment of text for default checkbox in ...

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https://hg.mozilla.org/integration/gaia-central/rev/ac5f3f9d98ba
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 1018322 - [ringtones] Fix alignment of text for default checkbox in share.html
Bumping manifests a=b2g-bump