feat: neutral checks should not count as a failure

Prevents `Check "foo" has the following status "completed" and conclusion "neutral"` from being a failure.

src/StatusCheck/Checks.php

@@ -50,7 +50,7 @@ public function refresh(): PromiseInterface
                     $return = TRUE_;
                 }
 
-                if ($status->status() !== 'completed' || $status->conclusion() === 'success' || $status->conclusion() === 'skipped') {
+                if ($status->status() !== 'completed' || $status->conclusion() === 'success' || $status->conclusion() === 'skipped' || $status->conclusion() === 'neutral') {
                     continue;
                 }