Fix incorrect CookieParam.PartitionKey type which caused deserializat…

…ion exceptions

lib/PuppeteerSharp/CookieParam.cs

@@ -88,11 +88,12 @@ public class CookieParam
         /// </summary>
         public CookieSourceScheme? SourceScheme { get; set; }
 
+#nullable enable
         /// <summary>
-        /// Cookie partition key. The site of the top-level URL the browser was visiting at the
-        /// start of the request to the endpoint that set the cookie. Supported only in Chrome.
+        /// Cookie partition key. Supported only in Chrome.
         /// </summary>
-        public string PartitionKey { get; set; }
+        public CookiePartitionKey? PartitionKey { get; set; }
+#nullable disable
 
         /// <summary>
         /// True if cookie partition key is opaque. Supported only in Chrome.

lib/PuppeteerSharp/CookiePartitionKey.cs

@@ -0,0 +1,18 @@
+namespace PuppeteerSharp
+{
+    /// <summary>
+    /// Cookie's Partition Key data.
+    /// </summary>
+    public class CookiePartitionKey
+    {
+        /// <summary>
+        /// The site of the top-level URL the browser was visiting at the start of the request to the endpoint that set the cookie.
+        /// </summary>
+        public string TopLevelSite { get; set; }
+
+        /// <summary>
+        /// Indicates if the cookie has any ancestors that are cross-site to the TopLevelSite.
+        /// </summary>
+        public bool HasCrossSiteAncestor { get; set; }
+    }
+}