Dart2-API updated to 3.7

Author: robertcsakany

openapi-generator-cli/lib/openapi-generator.jar

@@ -54,7 +54,7 @@
         <dependency>
             <groupId>com.bluetrainsoftware.maven</groupId>
             <artifactId>openapi-dart-generator</artifactId>
-            <version>3.7-SNAPSHOT</version>
+            <version>3.7</version>
         </dependency>        
     </dependencies>
 </project>