modules.archive: avoid shadowing zipfile std lib module

```
************* Module salt.modules.archive
salt/modules/archive.py:163: [W0621(redefined-outer-name), cmd_zip_] Redefining name 'zipfile' from outer scope (line 29)
salt/modules/archive.py:235: [W0621(redefined-outer-name), unzip_cmd] Redefining name 'zipfile' from outer scope (line 29)
salt/modules/archive.py:372: [W0621(redefined-outer-name), _render_filenames] Redefining name 'zipfile' from outer scope (line 29)
```