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

========

https://hg.mozilla.org/integration/gaia-central/rev/ff5977d5baae
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #23217 from sfoster/card-page-title-bug-1057396

Bug 1057396 - show page title in cards view. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/a0e1412d9914
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1057396 - display page title in cards view for browser windows

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "96541ed79ae317105cb06f9187d3dd506a2b90b9", 
+    "revision": "ff5977d5baae6c5a82ef3462c38e9b121eb5e23a", 
     "repo_path": "/integration/gaia-central"
 }