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

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https://hg.mozilla.org/integration/gaia-central/rev/5755214722b6
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #21974 from zbraniecki/1041403-update-mozl10n-api-in-shared

Update mozL10n API usage in shared. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/8ba17414b1c4
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1041403 - Update mozL10n API use cases in shared

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https://hg.mozilla.org/integration/gaia-central/rev/e7f1a9c7d6df
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #21930 from cctuan/1035739

Bug 1035739 - Nightly doesn't ask for PIN to unlock SIM (so it is not unlocked)

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https://hg.mozilla.org/integration/gaia-central/rev/39331f9dbefe
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1035739 - Nightly doesn't ask for PIN to unlock SIM (so it is not unlocked)

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "e176e4231c4902fb70fe602d002ed12da4826cb1", 
+    "revision": "5755214722b6bea0ed3ea4a2b3a35082fb28fbb7", 
     "repo_path": "/integration/gaia-central"
 }