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

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https://hg.mozilla.org/integration/gaia-central/rev/c250e324cd57
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #26865 from jrburke/bug922722-email-notification-count

Bug 922722 - [email] notifications count will only list most recent sync count r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/7830824c69e9
Author: jrburke <jrburke@gmail.com>
Desc: Bug 922722 - [email] notifications count will only list most recent sync count

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https://hg.mozilla.org/integration/gaia-central/rev/e1c1e41c91c0
Author: EragonJ (E.J.) <eragonj@eragonj.me>
Desc: Merge pull request #26809 from EragonJ/bug-1111903

Bug 1111903 - [Settings] Refactor Dialog Service with l10n best practice...

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https://hg.mozilla.org/integration/gaia-central/rev/9e24fb3adecc
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1111903 - [Settings] Refactor Dialog Service with l10n best practices
Bumping manifests a=b2g-bump