feat: add created_at and updated_at timestamps to User entity

- Added `created_at` and `updated_at` fields to the `User` entity.
- Used `@CreationTimestamp` and `@UpdateTimestamp` annotations for automatic timestamp management.
- Created migration script to add the new columns to the `users` table in the database.

src/main/java/leonardo/labutilities/qualitylabpro/controllers/users/UsersController.java

@@ -15,7 +15,6 @@
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.bind.annotation.*;
-import org.springframework.web.util.UriComponentsBuilder;
 
 @SecurityRequirement(name = "bearer-key")
 @RequestMapping("/users")

src/main/java/leonardo/labutilities/qualitylabpro/dtos/users/SignUpUsersRecord.java

@@ -9,7 +9,7 @@ public record SignUpUsersRecord(
         String email,
 
         @NotNull @Pattern(
-                regexp = "^(?=.*[!@#$%^&*()_+\\-=\\[\\]{};':\"\\|,.<>\\/?])(?=.*\\d{4,}).+$",
+                regexp = "^(?=.*[!@#$%^&*()_+\\-=\\[\\]{};':\",.<>/?])(?=.*\\d{4,}).+$",
                 message = "Password must contain at least 4 characters and one special character.")
         String password,
         @NotNull String username