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

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https://hg.mozilla.org/integration/gaia-2_1/rev/0279521be6a6
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #23718 from chirarobert/uplift_permission_fix

Bug 1059105 - [v2.1] Two apps with the name browser appear in the "App P...

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https://hg.mozilla.org/integration/gaia-2_1/rev/bc657eeea343
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1059105 - [v2.1] Two apps with the name browser appear in the "App Permissions" menu
Bumping manifests a=b2g-bump