Run wget and tar quietly on update

Don't show the output of wget and tar of the ISPConfig release when running the update script

--2021-03-23 15:33:41--  https://www.ispconfig.org/downloads/ISPConfig-3-stable.tar.gz
Resolving www.ispconfig.org (www.ispconfig.org)... 2606:4700:20::681a:bf6, 2606:4700:20::ac43:4b70, 2606:4700:20::681a:af6, ...
Connecting to www.ispconfig.org (www.ispconfig.org)|2606:4700:20::681a:bf6|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 4024765 (3.8M) [application/octet-stream]
Saving to: ‘ISPConfig-3.tar.gz’

ISPConfig-3.tar.gz  100%[=================>]   3.84M  --.-KB/s    in 0.07s   

2021-03-23 15:33:41 (55.8 MB/s) - ‘ISPConfig-3.tar.gz’ saved [4024765/4024765]

ispconfig3_install/.phplint.yml
ispconfig3_install/server/
etc