Replace old ngx_cache_purge module source with a maintained fork

[alexander-neumann-webdesign]

Currently the script downloads the ngx_cache_purge module from FRiCKLE, which had its last update 8 years ago. No wonder i've had problems using that module with nginx v1.22.0 (stable).

I suggest using an actively maintained fork, for example the one from nginx-modules or from torden.

I already tried it by manually changing the source in the script from /FRiCKLE/ to /nginx-modules/ (on line 367) and everything works like a charm.

[GwynethLlewelyn]

I concur, I've done the same under Ubuntu 22.04.1 LTS (jammy) and it works with that change...