fix: add -Dhttp.keepAlive=false and -Dmaven.wagon.http.pool=false to MAVEN_OPTS

For #101

auto-devops/maven.gitlab-ci.yml

@@ -96,6 +96,7 @@ services:
       -Djava.awt.headless=true
       -Xmx512m
       -Dhttp.keepAlive=false
+      -Dmaven.wagon.http.pool=false
 
     # As of Maven 3.3.0 instead of this you MAY define these options in `.mvn/maven.config` so the
     # same config is used when running from the command line.