fix(DemoApplication): Update import statement to use jakarta.servlet for compatibility

Author: meenu155

templates/spring-boot/src/main/java/com/example/DemoApplication.java

@@ -8,7 +8,7 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.web.bind.annotation.*;
 
-import javax.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequest;
 import java.io.*;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -18,7 +18,6 @@
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.*;
-import java.util.stream.Collectors;
 
 @SpringBootApplication
 @RestController