Network Security Manager warns safe renegotiation is not supported

[Yuji Nakao]

Hi, I tried to connect to https://elpa.gnu.org in eww Emacs 27.0.50, but
Network Security Manager warned `TLS connection to elpa.gnu.org:433 is
insecure for the following reason: * safe renegotiation is not
supported, connection not protected from impersonators`, and showed
`Continue connecting?` multiple choice prompt whether to accept the
certificate.

I guess this is caused by recently merged nsm.el, and
after some investigation, the warning disaapeared by setting
(setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3").
Is this a right workaround for this issue?

Thanks.
Yuji Nakao

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