fix: removed unused import from OpenShiftHelmLintTaskTest

removed the unused imports.

Author: kushagrasinha123ks

gradle-plugin/openshift/src/test/java/org/eclipse/jkube/gradle/plugin/task/OpenShiftHelmLintTaskTest.java

@@ -22,8 +22,6 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
-import java.io.IOException;
-
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.mockito.ArgumentMatchers.startsWith;
 import static org.mockito.Mockito.verify;