Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5a4176cf9719
Author: tamarahills <thills@mozilla.com>
Desc: Merge pull request #27982 from tamarahills/bugfix/1126379_force_ltr_on_emergency_dialer

Bug 1126379 - Force LTR for phone number and delete in the Emergency Dia...

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https://hg.mozilla.org/integration/gaia-central/rev/34357059ef72
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1126379 - Force LTR for phone number and delete in the Emergency Dialer.

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https://hg.mozilla.org/integration/gaia-central/rev/d935eff086fe
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #27948 from mikehenrty/bug-1125962-pin-retries

Bug 1125962 - Reset SIM PIN form after each entry attempt

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https://hg.mozilla.org/integration/gaia-central/rev/352ed34a4e56
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1125962 - Reset SIM PIN form after each entry attempt

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "5553a118471e041be28ad6406f148a2c1a10841f", 
+        "git_revision": "a42e6d7ac229e1fd68391ba36df4a0c75fd6b30d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "d007767cabd27f76572292414ad2304be6304bb8", 
+    "revision": "5a4176cf971907e3071a9160d05434079865ae1f", 
     "repo_path": "integration/gaia-central"
 }