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

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https://hg.mozilla.org/integration/gaia-central/rev/e2deec2aed23
Author: Salvador de la Puente González <neo.salvador@gmail.com>
Desc: Merge pull request #27818 from lodr/bug-1127722-avoid-selection

Bug 1127722 - [Usage][Text Selection] When first time use Usage app, description on "Data usage limit" page can be selected
r=:mai

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https://hg.mozilla.org/integration/gaia-central/rev/d077d396c58b
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: Bug 1127722 - [Usage][Text Selection] When first time use Usage app, description on "Data usage limit" page can be selected

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https://hg.mozilla.org/integration/gaia-central/rev/2a9765214e0f
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #27791 from rsajdok/bug#966228

Bug 966228 - Email notification with no subject displays subject as null r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/00086dfc26b0
Author: Robert Sajdok <robert.sajdok@protonmail.ch>
Desc: Bug 966228 - Email notification with no subject displays subject as 'null'

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a8576395130d18987f51e916a07aff8e0f23e930", 
+        "git_revision": "cff3964bebecea1f3292c99f80fff97725c03034", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ac70bfd20dd0e5ac4da8ddba599227ad2a4b9ebe", 
+    "revision": "e2deec2aed23d05d493085c0ea852c3181b05c3c", 
     "repo_path": "integration/gaia-central"
 }