Make scaledbigdecomal equals nullable (#69)

Author: Piiit

src/main/java/it/aboutbits/springboot/toolbox/type/ScaledBigDecimal.java

@@ -5,6 +5,7 @@
 import lombok.Getter;
 import lombok.experimental.Accessors;
 import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 
 import java.math.BigDecimal;
 import java.math.BigInteger;
@@ -218,7 +219,7 @@ public String toString() {
     }
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(@Nullable Object o) {
         if (this == o) {
             return true;
         }