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

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https://hg.mozilla.org/integration/gaia-central/rev/857ff9b64b4e
Author: Corey Frang <corey@bocoup.com>
Desc: Merge pull request #15535 from TheoChevalier/patch-1

Bug 961814 - [clock] Typo for "+1 Min" string (datadata-l10n-id) r=gnarf

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https://hg.mozilla.org/integration/gaia-central/rev/62d89dc233cf
Author: Théo Chevalier <theo.chevalier11@gmail.com>
Desc: Fixing a typo: datadata-l10n-id > data-l10n-id

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6946a71605af13e0284fb6f5bbe38aa4c05155d7", 
+    "revision": "857ff9b64b4e7dda8f2c6ddbf042d86c40026291", 
     "repo_path": "/integration/gaia-central"
 }