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

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https://hg.mozilla.org/integration/gaia-central/rev/61fe290720cb
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22694 from robertbindar/test_custom_data_support

Notification custom data support tests

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https://hg.mozilla.org/integration/gaia-central/rev/da5c19d88ba6
Author: robertbindar <robertbindar@gmail.com>
Desc: NotificationOptions data attribute integration tests
Bumping manifests a=b2g-bump