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

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https://hg.mozilla.org/integration/gaia-central/rev/32cd85e9f7ac
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #21318 from snowmantw/issue1032634

Bug 1032634 - [Build] Make GAIA_DEV_PIXELS_PER_PX shorter (alias)

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https://hg.mozilla.org/integration/gaia-central/rev/aa5db2680cf3
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1032634 - [Build] Make GAIA_DEV_PIXELS_PER_PX shorter (alias)
Bumping manifests a=b2g-bump