Remove unused imports

Author: garydgregory

src/test/java/org/apache/commons/io/input/CharSequenceInputStreamTest.java

@@ -29,9 +29,7 @@
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.Random;
-import java.util.Set;
 
-import org.apache.commons.io.Charsets;
 import org.apache.commons.io.CharsetsTest;
 import org.apache.commons.io.IOUtils;
 import org.junit.jupiter.api.Disabled;