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

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https://hg.mozilla.org/integration/gaia-central/rev/2bd19ebd6ad7
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16954 from zacc/bug_980281

Bug 980281 - Remove some redundant import_script calls from gaiatest

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https://hg.mozilla.org/integration/gaia-central/rev/24e75f0e6f60
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 980281 - Remove some redundant import_script calls from gaiatest
Bumping manifests a=b2g-bump