Deprecate GraphQL media type in favor of new one

This commit deprecates the `"application/graphql+json"` media type in
favor of the new `"application/graphql-response+json"`, since the former
has been removed in graphql/graphql-over-http#215.

Closes gh-29617

spring-web/src/main/java/org/springframework/http/MediaType.java

@@ -98,16 +98,34 @@ public class MediaType extends MimeType implements Serializable {
 	/**
 	 * Public constant media type for {@code application/graphql+json}.
 	 * @since 5.3.19
-	 * @see <a href="https://github.com/graphql/graphql-over-http">GraphQL over HTTP spec</a>
+	 * @see <a href="https://github.com/graphql/graphql-over-http/pull/215">GraphQL over HTTP spec change</a>
+	 * @deprecated as of 6.0.3, in favor of {@link MediaType#APPLICATION_GRAPHQL_RESPONSE}
 	 */
+	@Deprecated(since = "6.0.3", forRemoval = true)
 	public static final MediaType APPLICATION_GRAPHQL;
 
 	/**
 	 * A String equivalent of {@link MediaType#APPLICATION_GRAPHQL}.
 	 * @since 5.3.19
+	 * @deprecated as of 6.0.3, in favor of {@link MediaType#APPLICATION_GRAPHQL_RESPONSE_VALUE}
 	 */
+	@Deprecated(since = "6.0.3", forRemoval = true)
 	public static final String APPLICATION_GRAPHQL_VALUE = "application/graphql+json";
 
+	/**
+	 * Public constant media type for {@code application/graphql-response+json}.
+	 * @since 6.0.3
+	 * @see <a href="https://github.com/graphql/graphql-over-http">GraphQL over HTTP spec</a>
+	 */
+	public static final MediaType APPLICATION_GRAPHQL_RESPONSE;
+
+	/**
+	 * A String equivalent of {@link MediaType#APPLICATION_GRAPHQL_RESPONSE}.
+	 * @since 6.0.3
+	 */
+	public static final String APPLICATION_GRAPHQL_RESPONSE_VALUE = "application/graphql-response+json";
+
+
 	/**
 	 * Public constant media type for {@code application/json}.
 	 */
@@ -422,6 +440,7 @@ public class MediaType extends MimeType implements Serializable {
 		APPLICATION_CBOR = new MediaType("application", "cbor");
 		APPLICATION_FORM_URLENCODED = new MediaType("application", "x-www-form-urlencoded");
 		APPLICATION_GRAPHQL = new MediaType("application", "graphql+json");
+		APPLICATION_GRAPHQL_RESPONSE = new MediaType("application", "graphql-response+json");
 		APPLICATION_JSON = new MediaType("application", "json");
 		APPLICATION_JSON_UTF8 = new MediaType("application", "json", StandardCharsets.UTF_8);
 		APPLICATION_NDJSON = new MediaType("application", "x-ndjson");