Disable parallel tests

Testcontainers do not support parallel tests and upon local tests the build time stays pretty much the same

Issue #125

gradle.properties

@@ -1,4 +1,3 @@
 version=6.0.0-SNAPSHOT
 org.gradle.jvmargs=-Xmx3g -XX:+HeapDumpOnOutOfMemoryError
-org.gradle.parallel=true
 org.gradle.caching=true