ddns-scripts: fix updating IPv6 for netcup - #30516

Checking PR #30516: ddns-scripts: fix updating IPv6 for netcup (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (fix_ipv6_ddns-update-netcup-com_improved)

Commit 40c2e68 - ddns-scripts: fix updating IPv6 for netcup: update to 2.8.5:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "ddns-scripts: fix updating IPv6 for netcup: update to 2.8.5"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.