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

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https://hg.mozilla.org/integration/gaia-central/rev/f9bd92acba3e
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #19586 from lightsofapollo/ci-disable-after-script

NO BUG - do not run after_script (quick hack) until Bug 1015059 lands

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https://hg.mozilla.org/integration/gaia-central/rev/5f3ff61b3ff4
Author: James Lal <james@lightsofapollo.com>
Desc: NO BUG - do not run after_script (quick hack) until Bug 1015059 lands
Bumping manifests a=b2g-bump