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

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https://hg.mozilla.org/integration/gaia-central/rev/7ccbd68ef96e
Author: Ricky Chien <rickychien@users.noreply.github.com>
Desc: Merge pull request #33672 from rickychien/fail-to-back

Bug 1227537 - [TV][2.5] Failed to navigate back r=@luke-chang

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https://hg.mozilla.org/integration/gaia-central/rev/4aafb44f9ba7
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1227537 - [TV][2.5] Failed to navigate back

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "24a4408e3a0b589ecbb3266ba1aff3f957888cba", 
+        "git_revision": "acbcacb80be0cbe7d78d43b5befdd14c65b97324", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "57d5dda84b630aa5feb2c485bb6352c42ddec557", 
+    "revision": "7ccbd68ef96e658e29588b46290f2e3e10d72bcd", 
     "repo_path": "integration/gaia-central"
 }