[OptionsResolver] Remove BC layer for deprecatedNestedOptions in Symfony 8.0

Author: OskarStark

OptionsResolver.php

@@ -64,13 +64,6 @@ class OptionsResolver implements Options
      */
     private array $nested = [];
 
-    /**
-     * BC layer. Remove in Symfony 8.0.
-     *
-     * @var array<string, true>
-     */
-    private array $deprecatedNestedOptions = [];
-
     /**
      * The names of required options.
      */
@@ -222,23 +215,13 @@ public function setDefault(string $option, mixed $value): static
                 // Make sure the option is processed
                 unset($this->resolved[$option]);
 
-                // BC layer. Remove in Symfony 8.0.
-                if (isset($this->deprecatedNestedOptions[$option])) {
-                    unset($this->nested[$option]);
-                }
-
                 return $this;
             }
         }
 
         // This option is not lazy anymore
         unset($this->lazy[$option]);
 
-        // BC layer. Remove in Symfony 8.0.
-        if (isset($this->deprecatedNestedOptions[$option])) {
-            unset($this->nested[$option]);
-        }
-
         // Yet undefined options can be marked as resolved, because we only need
         // to resolve options with lazy closures, normalizers or validation
         // rules, none of which can exist for undefined options