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

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https://hg.mozilla.org/integration/gaia-central/rev/7fa646f5b633
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31196 from mwargers/1189806

Bug 1189806 - Fix intermittent failure in test_add_to_an_existing_contact_from_messages.py

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https://hg.mozilla.org/integration/gaia-central/rev/8cd728f6cae8
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1189806 - Fix intermittent failure in test_add_to_an_existing_contact_from_messages.py

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "ccafde915002c704ce94ace2120ff0d4199d6b59", 
+        "git_revision": "a6dd2593853bb0ef1636fe937ba3d7a16ac513b6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "1dc0b86ad387dd0d94cda88d13c4293b86f8caca", 
+    "revision": "7fa646f5b633b9f61a37682ccba1da45acf809f6", 
     "repo_path": "integration/gaia-central"
 }