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

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https://hg.mozilla.org/integration/gaia-central/rev/8f5ec8ed4799
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #26046 from DouglasSherk/1093862-callscreen-ended-calls

Bug 1093862 - Make Callscreen not respond to user input while there are no currently handled calls. r=gtorodelvalle, r=thills

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https://hg.mozilla.org/integration/gaia-central/rev/47361050ecd1
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1093862 - Make Callscreen not respond to user input while there are no currently handled calls. r=gtorodelvalle, r=thills

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https://hg.mozilla.org/integration/gaia-central/rev/d7cd13ad72a3
Author: Marina <marina.rodrigueziglesias@telefonica.com>
Desc: Merge pull request #25267 from gitmai/bug-1078243-reset-date-31

Bug 1078243 - [Costcontrol] When the Starting day of the reset period is...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/bfcdaa51e829
Author: mai <mri@tid.es>
Desc: Bug 1078243 - [Costcontrol] When the Starting day of the reset period is 31th, the app does not calculated correctly the end of the reset period.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "75e1c4ee15f4d84cf7bbe2b3f35cbe9b76579396", 
+    "revision": "8f5ec8ed4799dc38b567efbe52d842a737e6b86e", 
     "repo_path": "integration/gaia-central"
 }