chore: update GOPATH in makefile

[electricface]

Streamlined the GOPATH by removing redundant parts.

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关键摘要:

• GOPATH 环境变量的设置可能不正确，应该确保路径的顺序和逻辑正确
• GoPath 变量名与 GOPATH 环境变量名不一致，可能会导致混淆

是否建议立即修改:

• 是

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