Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/c2bdaf49fcdc
Author: Kenzo Ohta <mu-ota@kddi-tech.com>
Desc: Bug 900413: [Messages] Should detect and link 5 digit short codes in message text. - r=gnarf

- Updated minimum digits to be detected as a phone number to 5
- Ensured that when 5 digits, the number is only 5 characters without removing separators

Closes gh-12490

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "5d722a154b73027524bf6f41dc0886f32b7c0a91", 
+    "revision": "c2bdaf49fcdc693223a00f8a1da5bba762739373", 
     "repo_path": "/integration/gaia-central"
 }