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

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https://hg.mozilla.org/integration/gaia-central/rev/312e4c563d6b
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #26129 from crh0716/1098684

Bug 1098684 - Hide the AP PIN item r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/19ddfdd48074
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1098684 - Hide the AP PIN item

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https://hg.mozilla.org/integration/gaia-central/rev/7614da5f1f70
Author: RickyChien <RickyChien@users.noreply.github.com>
Desc: Merge pull request #26098 from RickyChien/bug-1097448

Bug 1097448 - Incorrect locales result in profile/webapps r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/5f53c30da080
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1097448 - Incorrect locales result in profile/webapps

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0cc496fad27f4ceaa708650c52de69d3296fde78", 
+    "revision": "312e4c563d6bbfff43be4aafd279b345dfd8a8d4", 
     "repo_path": "integration/gaia-central"
 }