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

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https://hg.mozilla.org/integration/gaia-1_4/rev/476f620db841
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #19493 from azasypkin/v1.4-bug-1011654-sent-audio

Bug 1011654 - [B2G][SMS]Opening the messages app after sending a message from the Call log causes the sent notification sound to occur a second time. r=schung

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https://hg.mozilla.org/integration/gaia-1_4/rev/193fd2e6686b
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1011654 - [B2G][SMS]Opening the messages app after sending a message from the Call log causes the sent notification sound to occur a second time. r=schung
Bumping manifests a=b2g-bump