net/dns/publicdns: update Mullvad DoH server list

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The following IPs are not used anymore: 193.19.108.2 and 193.19.108.3.
All of the servers are now named consistently under dns.mullvad.net.
Several new servers were added.

https://mullvad.net/en/help/dns-over-https-and-dns-over-tls/

Updates #5416
Updates #9345

Signed-off-by: James Tucker <james@tailscale.com>

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