Changes:
- linux: reset environment when running elevated commands (GHSA-p72w-3vw7-cg4p / CVE not yet assigned)
- update golang build chain to 1.26.6
- check_os_updates: fix powershell error on windows
- check_os_updates: make -u/--update work without root permissions
- check_os_updates: add --max-metadata-age to detect stale apt/yum/dnf repository metadata. defaults to 24h
- check_mount: show error if no options where specified
- check_mount: add support for checking multiple mounts
- check_nsc_web: fix using conditions twice (#453)
- check_network: support byte/s units in conditions
- windows: fix restart after auto update
- show versions of compiled in external check plugins with ./snclient -vV