Fix NoHttpMessageConverter error in ms teams notifier

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/notify/MicrosoftTeamsNotifier.java

@@ -92,7 +92,7 @@ public class MicrosoftTeamsNotifier extends AbstractEventNotifier {
 			return;
 		}
 
-		this.restTemplate.postForObject(webhookUrl, message, Void.class);
+		this.restTemplate.postForEntity(webhookUrl, message, Void.class);
 	}
 
 	@Override

spring-boot-admin-server/src/test/java/de/codecentric/boot/admin/notify/MicrosoftTeamsNotifierTest.java

@@ -51,7 +51,7 @@ public class MicrosoftTeamsNotifierTest {
 
 		notifier.doNotify(event);
 
-		verify(mockRestTemplate).postForObject(eq(URI.create("http://example.com")),
+		verify(mockRestTemplate).postForEntity(eq(URI.create("http://example.com")),
 				any(Message.class), eq(Void.class));
 	}
 
@@ -61,7 +61,7 @@ public class MicrosoftTeamsNotifierTest {
 
 		notifier.doNotify(event);
 
-		verify(mockRestTemplate).postForObject(eq(URI.create("http://example.com")),
+		verify(mockRestTemplate).postForEntity(eq(URI.create("http://example.com")),
 				any(Message.class), eq(Void.class));
 	}
 
@@ -72,7 +72,7 @@ public class MicrosoftTeamsNotifierTest {
 
 		notifier.doNotify(event);
 
-		verify(mockRestTemplate).postForObject(eq(URI.create("http://example.com")),
+		verify(mockRestTemplate).postForEntity(eq(URI.create("http://example.com")),
 				any(Message.class), eq(Void.class));
 	}