Ensure all files end with a new line

Update all files to ensure that they always end with a new-line
character.

Issue gh-8945

core/src/main/java/org/springframework/security/jackson2/package-info.java

@@ -20,7 +20,3 @@
  * @since 4.2
  */
 package org.springframework.security.jackson2;
-
-/**
- * Package contains Jackson mixin classes.
- */

etc/checkstyle/checkstyle-suppressions.xml

@@ -3,7 +3,6 @@
 		"-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
 		"https://checkstyle.org/dtds/suppressions_1_2.dtd">
 <suppressions>
-	<suppress files=".*" checks="NewlineAtEndOfFile" />
 	<suppress files=".*" checks="NonEmptyAtclauseDescription" />
 	<suppress files=".*" checks="NoWhitespaceBefore" />
 	<suppress files=".*" checks="OneTopLevelClass" />