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

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https://hg.mozilla.org/integration/gaia-central/rev/dbe7543ce99b
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #12911 from lissyx/bug906296

Bug 906296 - Ensure that settings from range value are Numbers

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https://hg.mozilla.org/integration/gaia-central/rev/13c7ccd68db5
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 906296 - Ensure that settings from range value are Numbers

When storing the settings that comes from a range input, we do some
rounding using toFixed(). Unfortunately, toFixed() returns a String.
Changes in the Gecko handling of some of the settings (namely, audio
policy) makes usage of String impossible and we need to ensure that we
pass some Number. We thus change the code to perform a supplementary
parseFloat() after toFixed() to ensure this.