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

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https://hg.mozilla.org/integration/gaia-central/rev/253fcdd72738
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #24361 from mikehenrty/bug-1050548-new-recording-icons

Bug 1050548 - Add high contrast recording icons

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https://hg.mozilla.org/integration/gaia-central/rev/92307f47539d
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1050548 - Add high contrast recording icons
Bumping manifests a=b2g-bump