Don't cache URL connection when loading junit-platform.properties contents

See also https://bugs.openjdk.java.net/browse/JDK-8224794

Closes #2194

(cherry picked from commit 4359d97)

Author: sormuras

junit-platform-launcher/src/main/java/org/junit/platform/launcher/core/LauncherConfigurationParameters.java

@@ -12,6 +12,7 @@
 
 import java.io.InputStream;
 import java.net.URL;
+import java.net.URLConnection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -63,7 +64,9 @@ private static Properties fromClasspathResource(String configFileName) {
 				URL configFileUrl = resources.get(0);
 				logger.info(() -> String.format(
 					"Loading JUnit Platform configuration parameters from classpath resource [%s].", configFileUrl));
-				try (InputStream inputStream = configFileUrl.openStream()) {
+				URLConnection urlConnection = configFileUrl.openConnection();
+				urlConnection.setUseCaches(false);
+				try (InputStream inputStream = urlConnection.getInputStream()) {
 					props.load(inputStream);
 				}
 			}