Debian 12 EOL is at 30.06.2028

checkmk/custom-files/local/monitor-os-expiry

@@ -23,6 +23,8 @@ elif [[ $OS =~ ^Debian[[:space:]]10 ]]; then
     expiredate="2024-06-30"
 elif [[ $OS =~ ^Debian[[:space:]]11 ]]; then
     expiredate="2026-06-30"
+elif [[ $OS =~ ^Debian[[:space:]]12 ]]; then
+    expiredate="2028-06-30"
 elif [[ $OS =~ ^Ubuntu[[:space:]]18\.04 ]]; then
     expiredate="2023-04-30"
 elif [[ $OS =~ ^Ubuntu[[:space:]]20\.04 ]]; then