Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4ad09c7b3e0b
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #26374 from pivanov/bug-1091719

Bug 1091719 - When setting a new alarm the header text is not centered

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https://hg.mozilla.org/integration/gaia-central/rev/f45d9a2370be
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1091719 - When setting a new alarm the header text is not centered

========

https://hg.mozilla.org/integration/gaia-central/rev/b827de8ca1e7
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 1103819 - Enable parallel build by default" for bustage

This reverts commit d36ff5979bb25dca0f7fbe9d952efc6b34ea6e43.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "44740bcc51d47ebdc054b05cace631ebaa8517a2", 
+    "revision": "4ad09c7b3e0b7a3f5a8b0bc08828c1d5351362d8", 
     "repo_path": "integration/gaia-central"
 }