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

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https://hg.mozilla.org/integration/gaia-central/rev/c75625a8906f
Author: Rob Wood <rwood@mozilla.com>
Desc: Merge pull request #31071 from rwood-moz/bug1186044

Bug 1186044 - Migrate to updated raptor docker container; r=garndt

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https://hg.mozilla.org/integration/gaia-central/rev/b1e7ee9b784a
Author: Rob Wood <rwood@mozilla.com>
Desc: Bug 1186044 - Migrate to updated raptor docker container; r=garndt

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https://hg.mozilla.org/integration/gaia-central/rev/6913f90e23b7
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #30906 from hfiguiere/bug1170640-sublist-view-tests

Bug 1170640 - SubListView unit tests r=squib

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https://hg.mozilla.org/integration/gaia-central/rev/109baee08349
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1170640 - SubListView unit test

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "8e1c7dfe8504e4ca8727a881bbe39aea430a4b12", 
+        "git_revision": "161fcd84be74a917b5cf709b291a1cd8fab62ece", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c998dabe06b32b11b9ae02071e9e22b36d78fe07", 
+    "revision": "c75625a8906f186ce1bd92f394b4f4c7973c86b5", 
     "repo_path": "integration/gaia-central"
 }