bug#54747: 28.1.50; package.el - Better error message if newer Emacs is required

[Daniel Mendler]

When trying to install a package which requires a newer Emacs version
than available the error message is a bit confusing. This issue affects
the commands `package-install` and `package-install-from-buffer`. As an
experienced Emacs user one is probably accustomed to this error message,
but I was informed that the error message may be misleading to new Emacs
users. Would it be possible to improve this error message? A better
message could be: "The package X requires Emacs Y or newer". Thank you!