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

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https://hg.mozilla.org/integration/gaia-central/rev/0454d23b393f
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #17998 from snowmantw/issue992466

Bug 992466 - Phone wont come back from sleep on ftu

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https://hg.mozilla.org/integration/gaia-central/rev/c950561e814f
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 992466 - Phone wont come back from sleep on ftu
Bumping manifests a=b2g-bump