Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/597aa600ba4d
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #24887 from Rik/redial-outgoing-1078921

Bug 1078921 - Only retrieve outgoing calls for Bluetooth redial r=drs
(cherry picked from commit 71a6d32f9a0c1dbce06cf3a191a67d046b9771f0)

Conflicts:
	apps/communications/dialer/test/unit/dialer_test.js
Bumping manifests a=b2g-bump