PyMilvus 2.3.8 Release Notes

Bug fixes

• fix: rename_collection not apply in current db(#1959) by @smellthemoon in #1961
• fix: Update versions in readme to latest by @XuanYang-cn in #1978
• fix: Remove the dependency of server_name to others by @XuanYang-cn in #1981

Full Changelog: v2.3.7...v2.3.8