Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f70b720a155e
Author: tamarahills <thills@mozilla.com>
Desc: Merge pull request #28119 from tamarahills/bugfix/1106175

Bug 1106175 - Align conference group UI participants to right for RTL. r...

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https://hg.mozilla.org/integration/gaia-central/rev/5a09e001d054
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1106175 - Align conference group UI participants to right for RTL. r=gsvelto.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "21dc7cb99eeef24c63d814f6d27d1f9a28ae202d", 
+        "git_revision": "a4fa768740a537863329856eee61087b1d67f4ba", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "f465c1e307db481d3ffcf0d64486cd5a92b7fda7", 
+    "revision": "f70b720a155e58371e7a5afec256c1c9c369dac1", 
     "repo_path": "integration/gaia-central"
 }