Set max pool size for parallel execution

platform-tooling-support-tests/src/test/resources/junit-platform.properties

@@ -2,8 +2,9 @@ junit.jupiter.execution.parallel.enabled=true
 junit.jupiter.execution.parallel.mode.default=concurrent
 junit.jupiter.execution.parallel.config.strategy=dynamic
 junit.jupiter.execution.parallel.config.dynamic.factor=0.25
+junit.jupiter.execution.parallel.config.dynamic.max-pool-size-factor=1
 
 junit.jupiter.testclass.order.default = \
     org.junit.jupiter.api.ClassOrderer$OrderAnnotation
 
-junit.jupiter.execution.timeout.default = 3 m
+junit.jupiter.execution.timeout.default = 3m