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

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https://hg.mozilla.org/integration/gaia-central/rev/aa45869dacda
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20614 from AndreiH/bug_1026403

Bug 1026403 - [Flame[v2.1] test_setup_and_send_active_sync_email is inte...

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https://hg.mozilla.org/integration/gaia-central/rev/2af98457c3e1
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 1026403 - [Flame[v2.1] test_setup_and_send_active_sync_email is intermittently failing
Bumping manifests a=b2g-bump