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

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https://hg.mozilla.org/integration/gaia-central/rev/a21e6a266061
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #21438 from ian-liu/settings/wifi/bug1033183_server_certificate_items_are_duplicated_when_disabling_and_reenabling_wifi

Bug 1033183 - [Wifi] Server certificate items are duplicated when disabling and re-enabling wifi, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/f3a1b83a65bb
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1033183 - [Wifi] Server certificate items are duplicated when disabling and re-enabling wifi
Bumping manifests a=b2g-bump