This has been fixed in the latest version of SF Workbench
- I am able to use API v56 (Winter '23) for the API Version and click the Login With Salesforce button and enter SF Workbench without any issue
I am NO LONGER ABLE to see the error
UNKNOWN ERROR: SOAP-ERROR: Parsing WSDL: Couldn't load from 'soapclient/sforce.550.partner.wsdl' : failed to load external entity "soapclient/sforce.550.partner.wsdl"