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

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https://hg.mozilla.org/integration/gaia-central/rev/ad975a347f34
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #19993 from chuck-lee/bug-1008736_remove_WIFI_TLS

Bug 1008736 - Remove TLS option in Wifi Settings. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/1450133a61e8
Author: Chuck Lee <chulee@mozilla.com>
Desc: Bug 1008736 - Remove TLS option in Wifi Settings.
Bumping manifests a=b2g-bump