PHP8 deprecated

[nono303]

Hi @klkvsk!
Using json-decode-stream with PHP8, i have some deprecated warning about return type.

Deprecated: Return type of JsonDecodeStream\Internal\SourceBuffer::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in \composer\vendor\klkvsk\json-decode-stream\src\Internal\SourceBuffer.php on line 37
Deprecated: Return type of JsonDecodeStream\Internal\SourceBuffer::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in \composer\vendor\klkvsk\json-decode-stream\src\Internal\SourceBuffer.php on line 46
Deprecated: Return type of JsonDecodeStream\Internal\SourceBuffer::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in \composer\vendor\klkvsk\json-decode-stream\src\Internal\SourceBuffer.php on line 57
Deprecated: Return type of JsonDecodeStream\Internal\SourceBuffer::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in \composer\vendor\klkvsk\json-decode-stream\src\Internal\SourceBuffer.php on line 62
Deprecated: Return type of JsonDecodeStream\Internal\SourceBuffer::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in \composer\vendor\klkvsk\json-decode-stream\src\Internal\SourceBuffer.php on line 68
Deprecated: Return type of JsonDecodeStream\Tokenizer::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in \composer\vendor\klkvsk\json-decode-stream\src\Tokenizer.php on line 39

Here is my patch to correct them (for my usecase only)
not sure for /src/Tokenizer.php l.39 that's the best way to do...

diff --git a/src/Internal/SourceBuffer.php b/src/Internal/SourceBuffer.php
index bad5a98..60d2428 100644
--- a/src/Internal/SourceBuffer.php
+++ b/src/Internal/SourceBuffer.php
@@ -34,7 +34,7 @@ class SourceBuffer implements Iterator
         }
     }
 
-    public function current()
+    public function current(): mixed
     {
         if (!$this->valid()) {
             return null;
@@ -43,7 +43,7 @@ class SourceBuffer implements Iterator
         return $this->buffer[$this->bufferPosition];
     }
 
-    public function next()
+    public function next(): void
     {
         $this->bufferPosition++;
         if ($this->bufferPosition == min($this->bufferMaxSize, $this->bufferSize)) {
@@ -54,18 +54,18 @@ class SourceBuffer implements Iterator
         }
     }
 
-    public function key()
+    public function key(): mixed
     {
         return $this->sourcePosition;
     }
 
-    public function valid()
+    public function valid(): bool
     {
         return $this->buffer !== null
             && $this->bufferPosition < $this->bufferSize;
     }
 
-    public function rewind()
+    public function rewind(): void
     {
         $this->source->rewind();
         $this->nextBuffer();
diff --git a/src/Tokenizer.php b/src/Tokenizer.php
index ea2543b..f7614a2 100644
--- a/src/Tokenizer.php
+++ b/src/Tokenizer.php
@@ -36,7 +36,7 @@ class Tokenizer implements IteratorAggregate
      * @psalm-return \Traversable<Token>
      * @throws TokenizerException
      */
-    public function getIterator()
+    public function getIterator(): Generator
     {
         return $this->tokens();
     }