Proper file endings

Author: jeffgbutler

src/main/java/org/mybatis/dynamic/sql/select/aggregate/package-info.java

@@ -16,4 +16,4 @@
 @NullMarked
 package org.mybatis.dynamic.sql.select.aggregate;
 
-import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.NullMarked;

src/main/java/org/mybatis/dynamic/sql/select/caseexpression/package-info.java

@@ -16,4 +16,4 @@
 @NullMarked
 package org.mybatis.dynamic.sql.select.caseexpression;
 
-import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.NullMarked;

src/main/java/org/mybatis/dynamic/sql/util/Buildable.java

@@ -18,4 +18,4 @@
 @FunctionalInterface
 public interface Buildable<T> {
     T build();
-}
+}