Check for file existence before deletion from cache (#9095)

* Rescue when deleting a non-existent cached gem file

When a gem was in the cache, but another process deletes it first, this
delete command fails.

To work around this, I'm rescuing from Errno::ENOENT and swalling the
error. The file is gone, and we can move on.

* Apply suggestion from @kou

Co-authored-by: Sutou Kouhei <kou@cozmixng.org>

---------

Co-authored-by: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>

Author: 3 people

bundler/lib/bundler/runtime.rb

@@ -240,7 +240,11 @@ def prune_gem_cache(resolve, cache_path)
 
         cached.each do |path|
           Bundler.ui.info "  * #{File.basename(path)}"
-          File.delete(path)
+
+          begin
+            File.delete(path)
+          rescue Errno::ENOENT
+          end
         end
       end
     end