Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/775dadf70f86
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16084 from flodolo/bug969193_okcostcontrol

Bug 969193 - [Cost Control] The string "Ok" is not localizable when launching cost control with a locked SIM

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https://hg.mozilla.org/integration/gaia-central/rev/84aad960d6eb
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 969193 - ][Cost Control] The string "OK" is not localizable when launching cost control with a locked SIM

Button is using a non existent string ID. Existing string with id “ok”
seems to be unused in other contexts.

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https://hg.mozilla.org/integration/gaia-central/rev/1f9ad26666f5
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16060 from svic/Bug_960473

Bug 960473 : Fix ReadNdef Issue when using Connect()

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https://hg.mozilla.org/integration/gaia-central/rev/e2f242561a8e
Author: Siddartha Pothapragada <Siddartha.Pothapragada@telekom.com>
Desc: Bug 960473 : Fix ReadNdef Issue when using Connect()

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "34586ee8ee64a4b06c8b877e43e7b1e9e79ed9eb", 
+    "revision": "775dadf70f866376fd19178c27e19e88c6d57026", 
     "repo_path": "/integration/gaia-central"
 }