Consider prereleases regardless of whether locked

Prereleases are NOT considered even when the dependency specification
includes a prerelease segment, if the dependency is not locked. To me
that doesn't make sense, because I could create a Gemfile with say gem
"rails", ">= 7.0.0.beta1" and I'd expect prereleases considered there
even if there's no lock file yet.

Co-authored-by: David Rodríguez <deivid.rodriguez@riseup.net>

lib/bundler/gem_version_promoter.rb

@@ -93,7 +93,7 @@ def sort_dep_specs(specs, package)
       locked_version = package.locked_version
 
       result = specs.sort do |a, b|
-        unless locked_version && (package.prerelease_specified? || pre?)
+        unless package.prerelease_specified? || pre?
           a_pre = a.prerelease?
           b_pre = b.prerelease?