Let's see if changed Jackson serialization fixes the test issues

generators/spring-boot/templates/src/main/java/_package_/config/JacksonConfiguration.java.ejs

@@ -22,9 +22,15 @@ package <%= packageName %>.config;
 import com.fasterxml.jackson.datatype.hibernate6.Hibernate6Module;
 import com.fasterxml.jackson.datatype.hibernate6.Hibernate6Module.Feature;
 <%_ } _%>
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
 import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 
+import java.io.IOException;
+import java.time.LocalTime;
+
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
@@ -37,7 +43,14 @@ public class JacksonConfiguration {
      */
     @Bean
     public JavaTimeModule javaTimeModule() {
-        return new JavaTimeModule();
+        final JavaTimeModule javaTime = new JavaTimeModule();
+        javaTime.addSerializer(LocalTime.class, new JsonSerializer<LocalTime>() {
+            @Override
+            public void serialize(LocalTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
+                gen.writeString(value.toString());
+            }
+        });
+        return javaTime;
     }
 
     @Bean