Mark EnabledIfDockerAvailableCondition as non-public class

Author: eddumelendez

modules/junit-jupiter/src/main/java/org/testcontainers/junit/jupiter/EnabledIfDockerAvailableCondition.java

@@ -8,7 +8,7 @@
 
 import java.util.Optional;
 
-public class EnabledIfDockerAvailableCondition implements ExecutionCondition {
+class EnabledIfDockerAvailableCondition implements ExecutionCondition {
 
     private final DockerAvailableDetector dockerDetector = new DockerAvailableDetector();