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

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https://hg.mozilla.org/integration/gaia-central/rev/8f54ef1edd43
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #26105 from rexboy7/1098162-contextmenu-smart-system

Bug 1098162 - [stingray][smart-system] Add spatial navigation to context...　r=johnhu,dwi2

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https://hg.mozilla.org/integration/gaia-central/rev/b5ef5c899801
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 1098162 - [stingray][smart-system] Add spatial navigation to context menu
Bumping manifests a=b2g-bump