update to v1.8.3 & fix: use defer Unlock in Incr/Decr to prevent lock leak (#313)

* chore: bump version to 1.8.3

* fix: use defer Unlock in Incr/Decr to prevent lock leak (#311)

- Add defer ca.Unlock() in Incr() and Decr() functions
- Fix potential deadlock when error occurs in type switch
- Pass race detection test

Co-authored-by: AI Assistant <ai@devfeel.io>

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Co-authored-by: AI Assistant <ai@devfeel.io>

Author: devfeel