devel/py-ply: Fix fetch
The previous MASTER_SITES URL doesn't contain the tarball any more:
$ wget --no-check-certificate https://www.dabeaz.com/ply/ply-3.11.tar.gz
--2024-09-13 01:16:27-- https://www.dabeaz.com/ply/ply-3.11.tar.gz
Resolving www.dabeaz.com (www.dabeaz.com)... 207.150.218.207
Connecting to www.dabeaz.com (www.dabeaz.com)|207.150.218.207|:443... connected.
WARNING: cannot verify www.dabeaz.com's certificate, issued by ‘CN=GeoTrust TLS RSA CA G1,OU=www.digicert.com,O=DigiCert Inc,C=US’:
Unable to locally verify the issuer's authority.
HTTP request sent, awaiting response... 404 Not Found
2024-09-13 01:16:27 ERROR 404: Not Found.
Approved by: portmgr@ (blanket unbreak)