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

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https://hg.mozilla.org/integration/gaia-central/rev/66dd68f62250
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18324 from AndreiH/995994

Bug 995994 - Fix test_setup_and_send_imap_email.TestSetupAndSendIMAPEmai...

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https://hg.mozilla.org/integration/gaia-central/rev/7cea2d38bca9
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 995994 - Fix test_setup_and_send_imap_email.TestSetupAndSendIMAPEmail
Bumping manifests a=b2g-bump