Bump Incident Collaboration plugin to v1.6.0 (#17143)

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

Makefile

@@ -102,7 +102,7 @@ PLUGIN_PACKAGES += mattermost-plugin-channel-export-v0.2.2
 PLUGIN_PACKAGES += mattermost-plugin-custom-attributes-v1.3.0
 PLUGIN_PACKAGES += mattermost-plugin-github-v2.0.0
 PLUGIN_PACKAGES += mattermost-plugin-gitlab-v1.3.0
-PLUGIN_PACKAGES += mattermost-plugin-incident-collaboration-v1.5.2
+PLUGIN_PACKAGES += mattermost-plugin-incident-collaboration-v1.6.0
 PLUGIN_PACKAGES += mattermost-plugin-jenkins-v1.1.0
 PLUGIN_PACKAGES += mattermost-plugin-jira-v2.4.0
 PLUGIN_PACKAGES += mattermost-plugin-nps-v1.1.0