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

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https://hg.mozilla.org/integration/gaia-central/rev/09258d9718d8
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #20107 from sfoster/bug-1019289-videos

Bug 1019289 - Final FTE videos from epang, with 1x, 1.5x and 2x res. r=fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/1ca54765672f
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1019289 - Final FTE videos from epang, with 1x, 1.5x and 2x resolutions. r=fcampo
Bumping manifests a=b2g-bump