Fix psalm regressions. (#1680)

Author: ChrisLightfootWild

Common/Configuration/Resolver/EnvironmentResolver.php

@@ -25,6 +25,7 @@ public function hasVariable(string $variableName): bool
         return !Configuration::isEmpty($env);
     }
 
+    #[\Override]
     public function retrieveValue(string $variableName): mixed
     {
         $value = getenv($variableName);

Common/Configuration/Resolver/PhpIniResolver.php

@@ -27,6 +27,7 @@ public function retrieveValue(string $variableName): mixed
         return $value;
     }
 
+    #[\Override]
     public function hasVariable(string $variableName): bool
     {
         $value = $this->accessor->get($variableName);

Common/Configuration/Resolver/SdkConfigurationResolver.php

@@ -36,11 +36,13 @@ public function __construct()
         $this->reader = new EnvSourceReader($envSources);
     }
 
+    #[\Override]
     public function retrieveValue(string $variableName): mixed
     {
         return $this->reader->read($variableName);
     }
 
+    #[\Override]
     public function hasVariable(string $variableName): bool
     {
         return !Configuration::isEmpty($this->reader->read($variableName));