Trim PEM-encoded text in PemContent.of

Author: scottfrederick

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ssl/pem/PemContent.java

@@ -25,7 +25,6 @@
 import java.nio.file.StandardOpenOption;
 import java.security.PrivateKey;
 import java.security.cert.X509Certificate;
-import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import java.util.regex.Pattern;
@@ -35,7 +34,6 @@
 import org.springframework.core.io.Resource;
 import org.springframework.util.Assert;
 import org.springframework.util.StreamUtils;
-import org.springframework.util.StringUtils;
 
 /**
  * PEM encoded content that can provide {@link X509Certificate certificates} and