Migrate from EE 8 to EE 9 in FolderCredentialsProvider (#469)

Author: jglick

src/main/java/com/cloudbees/hudson/plugins/folder/properties/FolderCredentialsProvider.java

@@ -72,7 +72,7 @@
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 import org.kohsuke.stapler.DataBoundConstructor;
-import org.kohsuke.stapler.StaplerRequest;
+import org.kohsuke.stapler.StaplerRequest2;
 import org.springframework.security.core.Authentication;
 
 /**
@@ -545,7 +545,7 @@ private synchronized boolean updateCredentials(@NonNull Domain domain, @NonNull
          * {@inheritDoc}
          */
         @Override
-        public AbstractFolderProperty<?> reconfigure(StaplerRequest req, JSONObject form) throws FormException {
+        public AbstractFolderProperty<?> reconfigure(StaplerRequest2 req, JSONObject form) throws FormException {
             return this;
         }