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

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https://hg.mozilla.org/integration/gaia-central/rev/d9689aa6c599
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #26365 from zacc/bug_1101227

Bug 1101227 - Resolve intermittent failure in test_system_notification_b...

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https://hg.mozilla.org/integration/gaia-central/rev/de8b191eb3dc
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1101227 - Resolve intermittent failure in test_system_notification_bar.py
Bumping manifests a=b2g-bump