[7.0] Fix various @psalm-return annotations

Author: nicolas-grekas

ParameterBag/ContainerBagInterface.php

@@ -33,13 +33,11 @@ public function all(): array;
      *
      * @param TValue $value
      *
-     * @return mixed
-     *
      * @psalm-return (TValue is scalar ? array|scalar : array<array|scalar>)
      *
      * @throws ParameterNotFoundException if a placeholder references a parameter that does not exist
      */
-    public function resolveValue(mixed $value);
+    public function resolveValue(mixed $value): mixed;
 
     /**
      * Escape parameter placeholders %.

ParameterBag/ParameterBagInterface.php

@@ -82,11 +82,9 @@ public function resolve();
     /**
      * Replaces parameter placeholders (%name%) by their values.
      *
-     * @return mixed
-     *
      * @throws ParameterNotFoundException if a placeholder references a parameter that does not exist
      */
-    public function resolveValue(mixed $value);
+    public function resolveValue(mixed $value): mixed;
 
     /**
      * Escape parameter placeholders %.