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

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https://hg.mozilla.org/integration/gaia-central/rev/68bdf9de4f67
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #24412 from asutherland/email-pop3-no-date

Bug 1062728 - [email/pop3] POP3 sync breaks on messages that lack a Date header. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/9cc7113eac9f
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 1062728 - [email/pop3] POP3 sync breaks on messages that lack a Date header. r=mcav

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/340
Bumping manifests a=b2g-bump