emacs.pkgs.project: Use project from elpa

The version of project on ELPA has now moved well beyond what was
available in emacs 28, and packages such as eglot are depending on
these newer versions.

pkgs/applications/editors/emacs/elisp-packages/elpa-packages.nix

@@ -66,9 +66,6 @@ self: let
       seq = if lib.versionAtLeast self.emacs.version "27"
             then null
             else super.seq;
-      project = if lib.versionAtLeast self.emacs.version "28"
-                then null
-                else super.project;
       # Compilation instructions for the Ada executables:
       # https://www.nongnu.org/ada-mode/
       ada-mode = super.ada-mode.overrideAttrs (old: {