Remove unused import

Author: garydgregory

src/test/java/org/apache/commons/lang3/RuntimeEnvironmentTest.java

@@ -21,7 +21,6 @@
 
 import java.io.IOException;
 import java.nio.charset.Charset;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.UUID;