chores: upgrade spring dependencies to spring boot 3.1.8

Signed-off-by: Michele <lars.michele@tu-dortmund.de>

Author: lyca

spring/pom.xml

@@ -32,7 +32,7 @@
 
     <properties>
         <module-name>io.cloudevents.spring</module-name>
-        <spring-boot.version>2.4.3</spring-boot.version>
+        <spring-boot.version>3.1.8</spring-boot.version>
     </properties>
 
     <dependencyManagement>

spring/src/test/java/io/cloudevents/spring/mvc/MvcRestControllerTests.java

@@ -29,7 +29,7 @@
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;
-import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.boot.test.web.server.LocalServerPort;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;

spring/src/test/java/io/cloudevents/spring/webflux/WebFluxRestControllerTests.java

@@ -30,7 +30,7 @@
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.web.codec.CodecCustomizer;
-import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.boot.test.web.server.LocalServerPort;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
@@ -198,4 +198,4 @@ public String toString() {
 		return "Foo [value=" + this.value + "]";
 	}
 
-}
+}