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

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https://hg.mozilla.org/integration/gaia-central/rev/d327e9514a8b
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18420 from zacc/bug_997679

Bug 997679 - Remove marionette calls where session may not exist (in the...

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https://hg.mozilla.org/integration/gaia-central/rev/97b30d930d7a
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 997679 - Remove marionette calls where session may not exist (in the event of a crash)
Bumping manifests a=b2g-bump