pipenv 2023.8.21

Release v2023.8.21

on Python PyPI

What's Changed

• Minor vendoring cleanup by @oz123 in #5840
• Some performance optimizations after analyzing benchmarks. by @matteius in #5841
• Do not include @ when no ref is specified by @matteius in #5845

Full Changelog: v2023.8.20...v2023.8.21