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

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https://hg.mozilla.org/integration/gaia-central/rev/c4d791edf54d
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #23163 from benfrancis/961724

Bug 961724 - Display title from application-name meta tag r=alive r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/28cb4cd66cee
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 961724 - Display title from application-name meta tag
Bumping manifests a=b2g-bump