Don't download OpenSSL from ftp.openssl.org anyomre

[ This is a backport to the 3.0 branch. ]

OpenSSL announced that they're changing how they handle releases in this
blog post: https://openssl.org/blog/blog/2024/04/30/releases-distribution-changes/

The tl;dr is that:

* ftp.openssl.org is being shut down (even for HTTP access)
* The releases at openssl.org/source will redirect to github
* git.openssl.org is also shut down (the git repo is on github)

This commit just changes over to using openss.org/source instead of
ftp.openssl.org. We might also need to switch to downloading directly
from Github... let's see.

It also changes to cloning the head of openssl from github too.

(cherry picked from commit 64c5011)

.github/workflows/test.yml

@@ -98,7 +98,7 @@ jobs:
           case ${{ matrix.openssl }} in
           openssl-*)
             if [ -z "${{ matrix.git }}" ]; then
-              curl -OL https://ftp.openssl.org/source/${{ matrix.openssl }}.tar.gz
+              curl -OL https://openssl.org/source/${{ matrix.openssl }}.tar.gz
               tar xf ${{ matrix.openssl }}.tar.gz && cd ${{ matrix.openssl }}
             else
               git clone -b ${{ matrix.branch }} --depth 1 ${{ matrix.git }} ${{ matrix.openssl }}