Fix JSON serialization exception

Author: patchoulish

source/Lambda/Cloud/Filesystems/LambdaCloudFilesystemIdJsonConverter.cs

@@ -17,7 +17,8 @@ public override LambdaCloudFilesystemId Read(
 			Type typeToConvert,
 			JsonSerializerOptions options) =>
 				new LambdaCloudFilesystemId(
-					reader.GetGuid());
+					Guid.Parse(
+						reader.GetString()));
 
 		/// <inheritdoc/>
 		public override void Write(

source/Lambda/Cloud/Instances/LambdaCloudInstanceIdJsonConverter.cs

@@ -17,7 +17,8 @@ public override LambdaCloudInstanceId Read(
 			Type typeToConvert,
 			JsonSerializerOptions options) =>
 				new LambdaCloudInstanceId(
-					reader.GetGuid());
+					Guid.Parse(
+						reader.GetString()));
 
 		/// <inheritdoc/>
 		public override void Write(

source/Lambda/Cloud/Users/LambdaCloudUserIdJsonConverter.cs

@@ -17,7 +17,8 @@ public override LambdaCloudUserId Read(
 			Type typeToConvert,
 			JsonSerializerOptions options) =>
 				new LambdaCloudUserId(
-					reader.GetGuid());
+					Guid.Parse(
+						reader.GetString()));
 
 		/// <inheritdoc/>
 		public override void Write(