Delete unused imports

spring-context-indexer/src/test/java/org/springframework/context/index/test/TestCompiler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,8 +21,6 @@ import java.io.IOException;
 import java.nio.file.Path;
 import java.util.Arrays;
 import java.util.Collections;
-import java.util.List;
-import java.util.stream.Collectors;
 
 import javax.annotation.processing.Processor;
 import javax.tools.JavaCompiler;