urlcheck scripts, migration to Python3 (bug #924139)

Hi all
After doing some tests and not finding any issue, www-master is going to be upgraded to Debian 11 bullseye soon.

There is pending work to migrate the urlcheck.py scripts to python3: bug #924139 and repo:
https://salsa.debian.org/webmaster-team/cron

If anybody can have a look, it's very appreciated.
I'll try to put some time on it during this weekend or next week, but my Python skills are quite limited.
Worst case, I would disable the cron job until the script is migrated. The logs of the last job would stay in https://www-master.debian.org/build-logs/

Kind regards
-- 
Laura Arjona Reina
https://wiki.debian.org/LauraArjona
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