Go 1.17

[l.mi...@gmail.com]

Go 1.17 was released recently - https://go.dev/blog/go1.17 - with claims of performance improvements:

> This release brings additional improvements to the compiler, namely a new way of passing function arguments and results. This change has shown about a 5% performance improvement in Go programs and reduction in binary sizes of around 2% for amd64 platforms. Support for more platforms will come in future releases.

I've tested this on a bunch of production workloads and I can confirm that I'm seeing ~5% cpu usage reduction. And that's on top of v2.29.1 upgrade which seem to also improve performance by 2-5%.

[Ben Kochie]

Yup, we'll probably use it in the next release. We have a bot that automatically updates our Go versions. There's a minor issue that needs fixing for the fact that Go doesn't release it as "1.17.0", but it will be fixed by the next Prometheus release.

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