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

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https://hg.mozilla.org/integration/gaia-central/rev/0634398cdbe6
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #19962 from jimporter/ringtone-share-default-text-wrap

Bug 1018322 - Checkbox "Use as default ringtone" looks bad when translat...

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https://hg.mozilla.org/integration/gaia-central/rev/e099802866ee
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 1018322 - Checkbox "Use as default ringtone" looks bad when translation spans on multiple lines
Bumping manifests a=b2g-bump