gb-frontend: Pins apache-httpd and php versions
gb-frontend: Pins apache-httpd and php versions

A new php version has been released (7.3), causing it to install into the folder c:\tools\php73, which different from what the rest of the Dockerfile was using. Because of this, the image was no longer able to start.

This commit pins the installed apache-httpd and php versions.
kubernetes-sigs/windows-testing,kubernetes-sigs/windows-testing