3.0.6 TypeError: Object of type PenStyle is not JSON serializable

[AugustoRubio]

Describe the bug
When I try turn any cable to invisible, the application gives me a error and a crash report. The option not close after the confirmation, and when I close the project and come back, the cable its visible again.
This project I import from the version 3.0.5 and I think this maybe a problem, but I try create another project and the error persist.

GNS3 version and operating system (please complete the following information):

• OS: Windows 11 PRO
• GNS3 version: 3.0.6
• Remote Server Linux Debian 13 (trixie), GNS 3.0.6

To Reproduce
Steps to reproduce the behavior:

1. Open the style menu off any cable.
2. Put the border style in "Invisible" and confirm.

Screenshots or videos

Log view:
****** Exception detected, traceback information saved in C:\Users****\AppData\Roaming\GNS3\3.0\exceptions.log ******

Traceback (most recent call last):
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\dialogs\style_editor_dialog_link.py", line 119, in done
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\dialogs\style_editor_dialog_link.py", line 108, in applyPreferencesSlot
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\items\link_item.py", line 154, in setLinkStyle
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\link.py", line 177, in update
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\controller.py", line 199, in put
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\controller.py", line 244, in request
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\http_client.py", line 354, in sendRequest
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\qt_init.py", line 182, in partial
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\http_client.py", line 728, in _executeHTTPQuery
File "C:\Users\circleci\project\Windows\gns3-gui\gns3\http_client.py", line 378, in addBodyToRequest
File "C:\python311\Lib\json_init.py", line 231, in dumps
File "C:\python311\Lib\json\encoder.py", line 200, in encode
File "C:\python311\Lib\json\encoder.py", line 258, in iterencode
File "C:\python311\Lib\json\encoder.py", line 180, in default
TypeError: Object of type PenStyle is not JSON serializable

[AugustoRubio]

After another try, I have the same problem on all options in cable style change.

I delete the server 3.0.6 and the client 3.0.6, put the server 3.0.5 and the client 3.0.5 and the problem gone. I think this problem is about the version 3.0.6.

[AugustoRubio]

After downgrade to 3.0.5 the cables go back to normal.

[grossmj]

The bug was fixed in v2.2.56.1 and the fix will be included in v3.0.7