Bumping gaia.json for 3 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/02a08136da7d
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #14803 from mcjimenez/bug951552

Bug 951552 - Incorrect behavior when first boot is run with a pin locked SIM (and no PIN is entered)
(cherry picked from commit 5e5c9f71911e2c83c2552273b3407ab4ea60e56c)

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https://hg.mozilla.org/integration/gaia-1_2/rev/8e78e0e752a5
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #14609 from arroway/bug-831948

Bug 831948 - WiFi Tethering should default to WPA2
(cherry picked from commit 47266e33ea9f48c61c6cc8697999ede8477fe20e)

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https://hg.mozilla.org/integration/gaia-1_2/rev/73e8e1ae4d37
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #14649 from fcampo/sms-overlay-style-broken-947285

Bug 947285 - [Messaging] Notice style is broken (r=julienw)
(cherry picked from commit 49cb38d06740e6b49ff30e89e11f428386250329)