update incident-collaboration to 1.4.0 (#16920)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/feature_flags.go

@@ -27,7 +27,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.TestBoolFeature = false
 	f.CloudDelinquentEmailJobsEnabled = false
 	f.CollapsedThreads = false
-	f.PluginIncidentManagement = "1.3.2"
+	f.PluginIncidentManagement = "1.4.0"
 }
 
 func (f *FeatureFlags) Plugins() map[string]string {