fix: incorrect development status in setup.py

Added legacy v2.6.1 release tag

Added legacy v2.6.0 release tag

Added legacy v2.5.1 release tag

Added legacy v2.5.0 release tag

Added legacy v2.4.0 release tag

Added legacy v2.3.0 release tag

Added legacy v2.2 release tag

Added legacy v2.1.1 release tag

Added legacy v2.1.0 release tag