chore(deps): bump github.com/anthropics/anthropic-sdk-go from 0.1.0-alpha.1 to 0.2.0-alpha.4

chore(deps): bump github.com/anthropics/anthropic-sdk-go from 0.1.0-alpha.1 to 0.2.0-alpha.4 #2252