Update to 10.4.3

Changelog:

• https://typo3.org/article/typo3-1043-and-9518-maintenance-releases-published
• https://get.typo3.org/release-notes/10.4.3

PR: 246774
Submitted by: Helmut Ritter <freebsd-ports@charlieroot.de> (maintainer)
Sponsored by: Netzkommune GmbH