Add suppression for Psalm warning

Added a `@psalm-suppress DocblockTypeContradiction` annotation to suppress Psalm's DocblockTypeContradiction warning in the CompileInjector.php file. This prevents the warning from being raised when the types documented in the DocBlock contradict each other.

src/CompileInjector.php

@@ -133,6 +133,7 @@ public function getInstance($interface, $name = Name::ANY)
             return $this->singletons[$dependencyIndex];
         }
 
+        /** @psalm-suppress DocblockTypeContradiction */
         if ($this->functions === null) {
             // @codeCoverageIgnoreStart
             $this->__wakeup();