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

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https://hg.mozilla.org/integration/gaia-central/rev/25063b98d1fd
Author: Michael Wu <mwu@mozilla.com>
Desc: Merge pull request #21210 from michaelwu/bug-1032659

Bug 1032659 - Replace font-weight: lighter with 300 r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/bbc0df774b6b
Author: Michael Wu <mwu@mozilla.com>
Desc: Bug 1032659 - Replace font-weight: lighter with 300
Bumping manifests a=b2g-bump