Upgrade to io.spring.nullability 0.0.8

Author: bclozel

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id "io.spring.nullability" version "0.0.5" apply false
+	id "io.spring.nullability" version "0.0.8" apply false
 }
 
 description = "Spring for GraphQL"

spring-graphql/src/main/java/org/springframework/graphql/server/webmvc/GraphQlWebSocketHandler.java

@@ -474,7 +474,7 @@ private static class SessionState {
 
 		private final WebSocketSessionInfo sessionInfo;
 
-		private final AtomicReference<Map<String, Object>> connectionInitPayloadRef = new AtomicReference<>();
+		private final AtomicReference<@Nullable Map<String, Object>> connectionInitPayloadRef = new AtomicReference<>();
 
 		private final Map<String, Subscription> subscriptions = new ConcurrentHashMap<>();