Update install instructions on Fedora

goncalossilva/cli has been up and running for much longer than the official recommendation, and over the years, it's been more reliable with its builds. See:
- https://github.com/goncalossilva/rpm-act/actions
- https://copr.fedorainfracloud.org/coprs/goncalossilva/act/monitor/

It's also fully automated. This means stable versions of Fedora get new builds quickly (even if builds on rawhide/preview versions tend to fail while the dust settles).

README.md

@@ -87,10 +87,10 @@ winget install nektos.act
 yay -Syu act
 ```
 
-### [COPR](https://copr.fedorainfracloud.org/coprs/rubemlrm/act-cli/) (Linux)
+### [COPR](https://copr.fedorainfracloud.org/coprs/goncalossilva/act/) (Linux)
 
 ```shell
-dnf copr enable rubemlrm/act-cli
+dnf copr enable goncalossilva/act
 dnf install act-cli
 ```