Fix: actually show the fail reason

[gdubicki]

I am sorry. I admit that I didn't really test it before because I didn't expect you to merge it so fast, @geerlingguy... 😓 Now it's tested and working:

TASK [geerlingguy.composer : Check if requested version parameters are valid] ******************************************************************************
fatal: [rocky8]: FAILED! => {
    "changed": false
}

MSG:

You cannot request a specific version AND keep the composer up to date. Set either composer_version or composer_keep_updated, but not both.

[geerlingguy]

lol oops!