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

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https://hg.mozilla.org/integration/gaia-central/rev/636ecb366e22
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #30404 from crh0716/1168763

Bug 1168763 - Always enable the button for toggle hotspot settings r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/50556d203d8f
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1168763 - Always enable the button for toggle hotspot settings

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https://hg.mozilla.org/integration/gaia-central/rev/8d444a0e2967
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #30424 from yzen/bug-1162040-costcontrol

Bug 1162040 - updating accessibility for gaia-icons used in Usage app.

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https://hg.mozilla.org/integration/gaia-central/rev/b842dd6b4372
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1162040 - updating accessibility for gaia-icons used in Usage app. r=gitmai

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "444db3e5f5618c15987c3d1523694ab857d3f83d", 
+        "git_revision": "e3d0d06f5aa2f4bdce671a04565d47748c088db0", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "6063c629b49281b235e321dac0d509c02a3e7663", 
+    "revision": "636ecb366e2254a88cbf6641855421030d30ebd8", 
     "repo_path": "integration/gaia-central"
 }