[BUGFIX] Allow PSR-7 Uris to allow no port at all

[BUGFIX] Allow PSR-7 Uris to allow no port at all

In order to set a PSR-7 based uri to the default port
the specs allow to set $uri->withPort(null) but our
tests and implementation restrict that.

Resolves: #84518
Releases: master, 8.7
Change-Id: Ic2c3d70fca35a767c7ed9d324eb93b30c66bbd3e
Reviewed-on: https://review.typo3.org/56416
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>