Merge pull request #260 from duckchip/missing-return-types-UpsertReso…

…urceListResponse

added missing return types, which throws errors in php8.1

src/Stream/UpsertResourceListResponse.php

@@ -33,15 +33,15 @@ public function __construct(
     /**
      * {@inheritdoc}
      */
-    public function current()
+    public function current(): array
     {
         return json_decode($this->line, true);
     }
 
     /**
      * {@inheritdoc}
      */
-    public function next()
+    public function next(): void
     {
         $this->line = $this->streamReader->getNextLine($this->bodyStream);
         $this->lineNumber++;
@@ -50,23 +50,23 @@ public function next()
     /**
      * {@inheritdoc}
      */
-    public function key()
+    public function key(): int
     {
         return $this->lineNumber;
     }
 
     /**
      * {@inheritdoc}
      */
-    public function valid()
+    public function valid(): bool
     {
         return null !== $this->line;
     }
 
     /**
      * {@inheritdoc}
      */
-    public function rewind()
+    public function rewind(): void
     {
         $this->bodyStream->rewind();
         $this->lineNumber = 1;