Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7af0e127fdda
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #21203 from jrburke/bug1031588-email-back-arrow

Bug 1031588 - [B2G][Email]Back arrow on 'New Account' page does not function after deleting two email acccounts r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/05822301a02d
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1031588 - [B2G][Email]Back arrow on 'New Account' page does not function after deleting two email acccounts

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https://hg.mozilla.org/integration/gaia-central/rev/53bfafc3e7cc
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #21240 from 6a68/bug-1032938-use-fmd-prod-servers

Bug 1032938 - Point find my device at production servers

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https://hg.mozilla.org/integration/gaia-central/rev/b59013cbba56
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1032938 - Point find my device at production servers
Bumping manifests a=b2g-bump