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

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https://hg.mozilla.org/integration/gaia-central/rev/aa978f1d90ea
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #27817 from gmarty/Bug-1126209-RTL-uninstall-app-dialog

Bug 1126209 - [RTL][Homescreen]The confirm information is not right-alig...

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https://hg.mozilla.org/integration/gaia-central/rev/c99042c24a9b
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1126209 - [RTL][Homescreen]The confirm information is not right-aligned when deleting apps from the homescreen

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0d7b35f23402c4cb29bca6b98280fec48a196dec", 
+        "git_revision": "6855dbe2b6ed6e15a0380c1229d9631837a2bda5", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "42545ce7016477c408fe5c009709f07a88b1325d", 
+    "revision": "aa978f1d90ea40b567c1587ecba1e2ccab473938", 
     "repo_path": "integration/gaia-central"
 }