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

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https://hg.mozilla.org/integration/gaia-central/rev/974156f7adae
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #24318 from begeeben/1011669_double_tapping_on_plus_sign_master

Bug 1011669 - [B2G][Browser]Double-tapping on plus sign (New Tab) presen...r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/fb9fe37a7c4e
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Bug 1011669 - [B2G][Browser]Double-tapping on plus sign (New Tab) presents more New Tabs than what shows when returning to New Tab screen

* Only respond to new tab clicks if not in transition and the current screen is TABS_Screen to prevent multiple empty tabs from created

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https://hg.mozilla.org/integration/gaia-central/rev/201d987b02b5
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #24224 from jmcanterafonseca/ice_settings_refactors

Bug 1068651 - [Contacts] [ICE] In occasions the ICE Group and Contact Settings info is not correctly updated

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https://hg.mozilla.org/integration/gaia-central/rev/73c2ea838529
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1068651 - [Contacts] [ICE] In occasions the ICE Group and Contact Settings info is not correctly updated

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "3382d021b373d858c811ef9392d18c10c9ee0a39", 
+    "revision": "974156f7adae5c07ca176d4cd999046f9a9cae45", 
     "repo_path": "/integration/gaia-central"
 }