[rubygems/rubygems] Fix `bundle remove` by invalidating cached `Bundle.defintion`.

Prior to this commit, `bundle add GEM_NAME` updated the lockfile,
but `bundle remove GEM_NAME` left GEM_NAME in the lockfile.

By invalidating the cached `Bundle.definition`, the existing code
handles that without a problem.

https://github.com/rubygems/rubygems/commit/aa0794d6a9

lib/bundler/injector.rb

@@ -72,6 +72,10 @@ module Bundler
 
         deps.each {|dep| Bundler.ui.confirm "#{SharedHelpers.pretty_dependency(dep, false)} was removed." }
       end
+
+      # Invalidate the cached Bundler.definition.
+      # This prevents e.g. `bundle remove ...` from using outdated information.
+      Bundler.reset_paths!
     end
 
     private

spec/bundler/commands/remove_spec.rb

@@ -13,6 +13,36 @@ RSpec.describe "bundle remove" do
     end
   end
 
+  context "after 'bundle install' is run" do
+    describe "running 'bundle remove GEM_NAME'" do
+      it "removes it from the lockfile" do
+        rack_dep = <<~L
+
+          DEPENDENCIES
+            rack
+
+        L
+
+        gemfile <<-G
+          source "#{file_uri_for(gem_repo1)}"
+
+          gem "rack"
+        G
+
+        bundle "install"
+
+        expect(lockfile).to include(rack_dep)
+
+        bundle "remove rack"
+
+        expect(gemfile).to eq <<~G
+          source "#{file_uri_for(gem_repo1)}"
+        G
+        expect(lockfile).to_not include(rack_dep)
+      end
+    end
+  end
+
   context "when --install flag is specified", :bundler => "< 3" do
     it "removes gems from .bundle" do
       gemfile <<-G