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

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https://hg.mozilla.org/integration/gaia-central/rev/533d536639c7
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22540 from Moz-TedC/bug-1042797-fix

Bug 1042797 - Prompting of uninstall now done by system app. Remove other prompts. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9b83dc4a5a63
Author: Ted Clancy (:tedders1) <tclancy@mozilla.com>
Desc: Bug 1042797 - Prompting of uninstall now done by system app. Remove other prompts. r=kgrandon
Bumping manifests a=b2g-bump