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

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https://hg.mozilla.org/integration/gaia-central/rev/70b57bf84d6f
Author: Sean Lee <weilonge@gmail.com>
Desc: Merge pull request #31903 from weilonge/seanlee/DataSync/master/Bug1205933

Bug 1205933 - Fix UTF-8 StringConversion functions r=michielbdejong,natim

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https://hg.mozilla.org/integration/gaia-central/rev/ff8c41a7ea79
Author: Sean Lee <selee@mozilla.com>
Desc: Bug 1205933 - Fix UTF-8 StringConversion functions r=michielbdejong

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https://hg.mozilla.org/integration/gaia-central/rev/83025d211f55
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #32241 from ferjm/bug1211537.synclastmodified

Bug 1211537 - last_modified value is removed from Syncto records. r=m…

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https://hg.mozilla.org/integration/gaia-central/rev/03fbded732e4
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Bug 1211537 - last_modified value is removed from Syncto records. r=michieldbdjong

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "cbf099c0858cc03172df87977c17f26f12e69fe2", 
+        "git_revision": "22f18bf1dc01a565fb3cdd008b2c0c9a6ed4d5db", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ebd69be778188cf52d2766b65b601c18277efe02", 
+    "revision": "70b57bf84d6fd8d87f759f0d13678034de70350d", 
     "repo_path": "integration/gaia-central"
 }