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

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https://hg.mozilla.org/integration/gaia-central/rev/8af2f10fe521
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #15680 from gtorodelvalle/contacts-bug-960525-undefined-last-name

Bug 960525 - [Contacts] undefined as contact's last name after merging

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https://hg.mozilla.org/integration/gaia-central/rev/af7449ed81cc
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 960525 - [Contacts] undefined as contact's last name after merging

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f6e33b4f0225457805f4453a924019e9205736f1", 
+    "revision": "8af2f10fe5218d60e5b1c6ab383e776bd0f80981", 
     "repo_path": "/integration/gaia-central"
 }