ci: drop dead wgetrc as there are no uses of wget in our CI images

Note that if you grep, you'll find two instances of `wget`, but those are not
executed in our docker images, but on the generic FDo gitlab runners, so the
/etc/wgetrc file in our docker images cannot affect them.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34684>
2 files changed