[9.20] chg: ci: Fix wiki.wireshark.org links in doc/arm

Fix the broken link https://wiki.wireshark.org/TLS#tls-decryption to
simply https://wiki.wireshark.org/TLS. The links in the wireshark
wiki have been updated somewhen after october 2025 as shown by
https://web.archive.org/web/20251008165051/https://wiki.wireshark.org/TLS#tls-decryption and https://wiki.wireshark.org/TLS.

Backport of MR !11284

Merge branch 'backport-andoni/fix-wireshark-links-in-doc-arm-9.20' into 'bind-9.20'

See merge request isc-projects/bind9!11286