Enforce LF on VerifyApply fixtures to keep tests OS-agnostic

Author: ParkerM

spring-javaformat-maven/spring-javaformat-maven-plugin/src/it/.gitattributes

@@ -0,0 +1,2 @@
+# Test resources that need a predictable eol
+apply*/src/main/java/simple/Simple.java eol=lf

spring-javaformat-maven/spring-javaformat-maven-plugin/src/test/java/io/spring/format/maven/VerifyApply.java

@@ -30,7 +30,7 @@
  */
 public class VerifyApply {
 
-	private static final String LF = System.lineSeparator();
+	private static final String LF = "\n";
 
 	private static final String JAVA_FILE = "src/main/java/simple/Simple.java";