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

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https://hg.mozilla.org/integration/gaia-central/rev/269c56ee3c58
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #15991 from zacc/bug_967908

Bug 967908 Fix timing in test_sms_contact_input_validation.py

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https://hg.mozilla.org/integration/gaia-central/rev/fb17eadc4065
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 967908 - Repair test_sms_contact_input_validation r=zac

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "19a17a2e648b0c3a9d7805f59232f08e723a29fc", 
+    "revision": "269c56ee3c58127c22ca1a4162a766d88eefec9c", 
     "repo_path": "/integration/gaia-central"
 }