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

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https://hg.mozilla.org/integration/gaia-central/rev/4a4d47dcd812
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #31329 from mikehenrty/bug-1193737-safe-mode

safe mode screen.

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https://hg.mozilla.org/integration/gaia-central/rev/53ce54d51dd3
Author: Fabrice Desré <fabrice@desre.org>
Desc: Bug 1193737 - Add safe_mode.html to handle safe mode confirmation

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https://hg.mozilla.org/integration/gaia-central/rev/3d0e70db7271
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #31552 from sfoster/music-scanning-rtl-bug-1179696

Bug 1179696 - Display bidi content when scanning

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https://hg.mozilla.org/integration/gaia-central/rev/fab6d00769b9
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1179696 - Display bidi content when scanning

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "109cbbd3a6b480e06e184df72a5e4452c8e69bab", 
+        "git_revision": "1807da51b070a08e5783b3dd55bcb80817a90fd7", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "fad4ea01d42b8d5029de5fd20fa03ea74cc7acd6", 
+    "revision": "4a4d47dcd8127562e1b2fe0d6c25233d05fd2cb7", 
     "repo_path": "integration/gaia-central"
 }