Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9fde3e6f1a18
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 1067307 - Disable test_eme_add_collection: crash when tapping on a collection a=test-only"

This reverts commit 8ed821f81237e52e7eb91bce55f2290a544bf29a.

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https://hg.mozilla.org/integration/gaia-central/rev/90a3392ca23a
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #24175 from zacc/bug_1068670

Bug 1068670 - Update the gaiatest treeherder mixin to be able to push to...

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https://hg.mozilla.org/integration/gaia-central/rev/cbb62af84ee2
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1068670 - Update the gaiatest treeherder mixin to be able to push to Flame-KK on treeherder
Bumping manifests a=b2g-bump