Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/550b7a5b073f
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 1086674 - [2.1][l10n][Contacts] Multiple locales: The 'Add Picture' string is truncated on 'Add contact' screen.

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https://hg.mozilla.org/integration/gaia-2_1/rev/f1e7ca90ddff
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25596 from mpizza/Bug_1079647_disallow_failed_download_item_resume_v2.1

Bug 1079647 - [Woodduck][Downloads]Stopped file can not try again

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https://hg.mozilla.org/integration/gaia-2_1/rev/474eeef71784
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 1079647 - [Woodduck][Downloads]Stopped file can not try again
Bumping manifests a=b2g-bump