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

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https://hg.mozilla.org/integration/gaia-central/rev/90c30688c09d
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #17735 from jrburke/bug989104-email-no-build-timeout

Bug 989104 - [email] allow for longer module load timeouts for background loads r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/69ab41300b6c
Author: jrburke <jrburke@gmail.com>
Desc: Bug 989104 - [email] allow for longer module load timeouts for background loads
Bumping manifests a=b2g-bump