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

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https://hg.mozilla.org/integration/gaia-central/rev/aa3ab2d389dc
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #24593 from asutherland/email-fix-pop3-attachments

Bug 1068116 - [email/POP3] email.js POP3 attachment regressions: binary attachments are corrupted on download and partially downloaded attachments are saved to disk. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/4e7ef92c8221
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 1068116 - [email/POP3] email.js POP3 attachment regressions: binary attachments are corrupted on download and partially downloaded attachments are saved to disk. r=mcav

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/342 in gaia
Bumping manifests a=b2g-bump