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

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https://hg.mozilla.org/integration/gaia-central/rev/22c08158e15f
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #16731 from asutherland/email-fix-bare

Bug 978005 - [email] Fix usage of Bareword DOM constructors TextDecoder and TextEncoder. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/3480b37fdce0
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 978005 - [email] Fix usage of Bareword DOM constructors TextDecoder and TextEncoder. r=asuth

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/288
Bumping manifests a=b2g-bump