fix directory concatination

lua/dep/package.lua

@@ -251,7 +251,7 @@ function package:new(spec, overrides)
   o.name = spec.as or o.name or id:match("^[%w-_.]+/([%w-_.]+)$")
   o.url = spec.url or o.url or ("https://github.com/"..id..".git")
   o.branch = spec.branch or o.branch
-  o.dir = base_dir..o.name
+  o.dir = base_dir.."/"..o.name
   o.commit = spec.commit
   o.pin = overrides.pin or spec.pin or o.pin
   o.enabled = not overrides.disable and not spec.disable and o.enabled