Change CI build to use parallel=false to use fewer resources. An attempt to fix #871

Author: dturner

.github/ci-gradle.properties

@@ -15,7 +15,7 @@
 #
 
 org.gradle.daemon=false
-org.gradle.parallel=true
+org.gradle.parallel=false
 org.gradle.jvmargs=-Xmx5120m
 org.gradle.workers.max=2