Removed public modifier on JUnit5 test classes

Author: simasch

src/test/java/org/utplsql/maven/plugin/UtPlsqlMojoIT.java

@@ -14,7 +14,7 @@
 
 @MavenGoal("test")
 @MavenJupiterExtension
-public class UtPlsqlMojoIT {
+class UtPlsqlMojoIT {
 
     @MavenTest
     void minimalist(MavenExecutionResult result) {

src/test/java/org/utplsql/maven/plugin/UtPlsqlMojoTest.java

@@ -12,7 +12,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-public class UtPlsqlMojoTest {
+class UtPlsqlMojoTest {
 
     private UtPlsqlMojo createUtPlsqlMojo() {
         System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "debug");