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

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https://hg.mozilla.org/integration/gaia-central/rev/21f7a96d9cd7
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Merge pull request #23434 from wilsonpage/1059833

Bug 1059833 - [gaia-header] Button transition-delays should only impact touch/user interaction

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https://hg.mozilla.org/integration/gaia-central/rev/f6aa991c43f9
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1059833 - [gaia-header] Button transition-delays should only impact touch/user interaction
Bumping manifests a=b2g-bump