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

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https://hg.mozilla.org/integration/gaia-central/rev/b6c30e6dae60
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23519 from mikehenrty/bug-1060661-font-utils-test

Bug 1060661 - Use Email instead of SMS to test font size utils

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https://hg.mozilla.org/integration/gaia-central/rev/ff7234302fee
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1060661 - Use Email instead of SMS to test font size utils
Bumping manifests a=b2g-bump