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

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https://hg.mozilla.org/integration/gaia-1_4/rev/c204f72593a6
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18296 from mcav/email-toolbar

Bug 993215 - [Email] toolbar covers the bottom line of long emails. r=jrburke

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https://hg.mozilla.org/integration/gaia-1_4/rev/1efe9dd2297a
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18347 from mcav/acctsslice

Bug 966323 - [B2G] Email account unrecognizable when sharing a link from... r=asuth
Bumping manifests a=b2g-bump