Golang update to 1.17 in builder Dockerfile

[jhaoheng]

This pull request bumps up the Golang version from 1.15 to latest 1.17 for lambci/lambda:build-go1.x.

• remove the dep, reason

Because GoLang v1.16 and above start to support embed solution, it could help developer to embed their data easier. And it help me a lot. And dep command is deprecated and can not build with v1.16.

Thank you

docker build -t lambci/lambda:build-go1.x .
docker run -it --rm lambci/lambda:build-go1.x  go version

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