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

========

https://hg.mozilla.org/integration/gaia-central/rev/207ca4a72172
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #18840 from 6a68/bug-1004099-fxa-settingsapp-remove-accountId

Bug 1004099 - FxA Settings app - remove refs to 'accountId', replace with 'email'

========

https://hg.mozilla.org/integration/gaia-central/rev/fd62b6a13e42
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1004099 - FxA Settings app - remove refs to 'accountId', replace with 'email'. r=arthurcc

========

https://hg.mozilla.org/integration/gaia-central/rev/3deb1abd401f
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #18839 from 6a68/bug-1003993-fxa-systemapp-remove-accountId

Bug 1003993 - FxA System app - remove refs to 'accountId', replace with 'email'

========

https://hg.mozilla.org/integration/gaia-central/rev/b6d9156c743b
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1003993 - FxA System app - remove refs to 'accountId', replace with 'email'. r=ferjm
Bumping manifests a=b2g-bump