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

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https://hg.mozilla.org/integration/gaia-central/rev/8ca55a9510cd
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #26086 from jrburke/bug1087184-email-contact-query-lowercase-fix

Bug 1087184, second part of fix, to allow for undefined emailAddress r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/282417be51b0
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1087184, second part of fix, to allow for undefined emailAddress, related to 3c1668ad793d4f1a40831c46638acef38e0db230
Bumping manifests a=b2g-bump