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

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https://hg.mozilla.org/integration/gaia-central/rev/4c2751f5fc24
Author: Seinlin <seinlin.maung@gmail.com>
Desc: Merge pull request #28978 from martasect/Bug_1135972

Bug 1135972 - Direction of 'Next' and 'Back' buttons contradict with page indicator on Guided Tour page. r=gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/4135c97f35f8
Author: Marta Piekarska <marta@sec.t-labs.tu-berlin.de>
Desc: Bug 1135972 - [RTL][Privacy Control] Direction of 'Next' and 'Back' buttons contradict with page indicator on Guided Tour page +autolander

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "91c3fe485fc876e7f2f8b3b6a2ca6a804e675b3a", 
+        "git_revision": "9b6f3024e4d0e62dd057231f4b14abe1782932ab", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "f0579a6525108026651106851abb5d70a5e19d77", 
+    "revision": "4c2751f5fc24ffad381aae2c50b160cba0f33d36", 
     "repo_path": "integration/gaia-central"
 }