Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/815431fae560
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #11405 from EverythingMe/bugfix-tasker-shortcuts

[Bug 902540] fix experience id overriding shortcuts' query [r=crdlc]

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https://hg.mozilla.org/integration/gaia-central/rev/8eddba0c2dd8
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 902540] fix experience id overriding shortcuts' query [r=crdlc]