Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3842156466e7
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1043615 - Update l10n ID's for strings modified with this change. r=flod

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https://hg.mozilla.org/integration/gaia-central/rev/5b07856ac9d9
Author: Ed Morley <edmorley@users.noreply.github.com>
Desc: Merge pull request #22400 from yurenju/test-l10n

Bug 1047244 - gaia-build jobs failing with "build.test.js | Build GAIA f...

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https://hg.mozilla.org/integration/gaia-central/rev/26a8b4897235
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1047244 - gaia-build jobs failing with "build.test.js | Build GAIA from differece app list GAIA_DEVICE_TYPE=tablet" or "multilocale.test.js | multilocale Integration tests "before all" hook"

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "d52716b553233726a228a7c829351d4e97c8b548", 
+    "revision": "3842156466e71f41748f86777a1b8fbd379441c0", 
     "repo_path": "/integration/gaia-central"
 }