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

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https://hg.mozilla.org/integration/gaia-central/rev/b5d5da206034
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26769 from huchengtw-moz/bug-1111501-remove-unwanted-settings

Bug 1111501 - [Stingray] remove device pixel ratio settings, r=chens

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https://hg.mozilla.org/integration/gaia-central/rev/fb811094bbdc
Author: John Hu <johu@mozilla.com>
Desc: Bug 1111501 - [Stingray] remove device pixel ratio settings
Bumping manifests a=b2g-bump