Fixes <https://bugs.gnu.org/35053>.
Reported by Efraim Flashner <efraim@flashner.co.il>.
Previously 'check-github-url' would let Guile 2.2's (web client) module
take care of opening the connection. Consequently, it wouldn't use the
TLS priority strings that we use in (guix build download),
'open-connection-for-uri'. In particular, it would not disable TLSv1.3,
which would trigger <https://bugs.gnu.org/34102> for github.com.
* guix/scripts/lint.scm (check-github-url): Add #:timeout parameter.
[follow-redirect]: Change parameter name to 'url' and pass it to
'string->uri'. Call 'guix:open-connection-for-uri' to open the
connection and pass it to 'http-head' via #:port.
702c3c7dab