Remove php 7.4 and 8.0 from CI

src/ExtrusiveBuffer.php

@@ -20,23 +20,16 @@ class ExtrusiveBuffer extends LazyBuffer
      */
     public const BUFFER_DEFAULT_SIZE = 100;
 
-    /**
-     * @var int<1, max>
-     */
-    private int $size;
-
     /**
      * @param iterable<TokenInterface> $stream
      * @param int<1, max> $size
      */
     public function __construct(
         iterable $stream,
-        int $size = self::BUFFER_DEFAULT_SIZE
+        private int $size = self::BUFFER_DEFAULT_SIZE
     ) {
-        $this->size = $size;
-
         /** @psalm-suppress RedundantCondition */
-        assert($this->size > 0, 'Buffer size must be greater than 0, but ' . $size . ' passed');
+        assert($this->size > 0, 'Buffer size must be greater than 0, but ' . $this->size . ' passed');
 
         parent::__construct($stream);
     }

src/MutableBuffer.php

@@ -10,17 +10,14 @@
  */
 class MutableBuffer implements BufferInterface
 {
-    private BufferInterface $parent;
-
     /**
      * @var array<int<0, max>, TokenInterface>
      */
     private array $overrides = [];
 
-    public function __construct(BufferInterface $parent)
-    {
-        $this->parent = $parent;
-    }
+    public function __construct(
+        private BufferInterface $parent,
+    ) {}
 
     /**
      * @param int<0, max> $offset