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

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https://hg.mozilla.org/integration/gaia-central/rev/894a7f2886a7
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #16545 from asutherland/fixtest-pop3-badpwd

Bug 975298 - [email/backend] intermittent GELAM test failure for POP3 in test_account_bad_password_error. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/8167afbf7c9c
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 975298 - [email/backend] intermittent GELAM test failure for POP3 in test_account_bad_password_error. r=mcav

Land the results of the GELAM fix from
https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/285
into gaia.  The test fix involved adding additional logging and we want
/ need that logging propagated.
Bumping manifests a=b2g-bump