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

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https://hg.mozilla.org/integration/gaia-central/rev/729f7f9da5e7
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #24043 from luke-chang/1043682_sms_caret_glitch

Bug 1043682 - Caret positioning glitch after deleting a saved draft, r=azasypkin

- keep one <BR> at the end of a content-editable element whenever moving the cursor.

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https://hg.mozilla.org/integration/gaia-central/rev/1f45764b10f0
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1043682 - Caret positioning glitch after deleting a saved draft
Bumping manifests a=b2g-bump