Update version of multiapps plugin to 3.1.1

Author: theghost5800

Dockerfile

@@ -26,8 +26,8 @@ RUN addgroup -gid 1000 piper && \
 USER piper
 WORKDIR ${USER_HOME}
 
-ARG MTA_PLUGIN_VERSION=3.0.3
-ARG MTA_PLUGIN_URL=https://github.com/cloudfoundry-incubator/multiapps-cli-plugin/releases/download/v${MTA_PLUGIN_VERSION}/multiapps-plugin.linux64
+ARG MTA_PLUGIN_VERSION=3.1.1
+ARG MTA_PLUGIN_URL=https://github.com/cloudfoundry/multiapps-cli-plugin/releases/download/v${MTA_PLUGIN_VERSION}/multiapps-plugin.linux64
 ARG CSPUSH_PLUGIN_VERSION=1.3.2
 ARG CSPUSH_PLUGIN_URL=https://github.com/dawu415/CF-CLI-Create-Service-Push-Plugin/releases/download/${CSPUSH_PLUGIN_VERSION}/CreateServicePushPlugin.linux64