Remove @UsesUnsafeJava annotations

Closes gh-14072

Author: dreis2211

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SignalUtils.java

@@ -25,7 +25,6 @@
  * @since 1.1.0
  */
 @SuppressWarnings("restriction")
-@UsesUnsafeJava
 public final class SignalUtils {
 
 	private static final Signal SIG_INT = new Signal("INT");