docs: update version reference to v0.7.4

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mpyw

README.md

@@ -40,7 +40,7 @@ go run github.com/mpyw/goroutinectx/cmd/goroutinectx@latest ./...
 ```
 
 > [!CAUTION]
-> To prevent supply chain attacks, pin to a specific version tag instead of `@latest` in CI/CD pipelines (e.g., `@v0.7.3`).
+> To prevent supply chain attacks, pin to a specific version tag instead of `@latest` in CI/CD pipelines (e.g., `@v0.7.4`).
 
 ### As a Library