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

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https://hg.mozilla.org/integration/gaia-central/rev/4021788f33a3
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #32424 from asutherland/email-no-grow-throw

Bug 1206156 - [email] Make requestGrowth not throw on misuse to avoid breaking vscroll state machine. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/ae1f5d38e8b9
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 1206156 - [email] Make requestGrowth not throw on misuse to avoid breaking vscroll state machine. r=jrburke

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/395

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https://hg.mozilla.org/integration/gaia-central/rev/42b50a7262b7
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #32408 from gasolin/issue-1205596

Bug 1205596 - allow puk2-changed event, r=yzen

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https://hg.mozilla.org/integration/gaia-central/rev/60fea382441b
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1205596 - allow puk2-changed event, r=yzen

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "879b8d17e2082779b99917e507097d4aef34b79c", 
+        "git_revision": "6c7548db65047541e24b1500c53e16041509d435", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "48c1c0b2391a0575e81e07d4270ee0d8af42b884", 
+    "revision": "4021788f33a35e267e745e689bba7108fc78b2d5", 
     "repo_path": "integration/gaia-central"
 }