Upgrade to Go 1.17

[ghost]

Upgrade to go 1.17

• update go.mod
• update Dockerfile
• update GitHub actions
• fix new go vet errors

resolves #330

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Reviewer checklist

• Read PR description: a summary about the changes is required
• Changelog updated
• Documentation: docs/{Reference, Cli, ...}, Docker and cli help/usage
• Pulled branch, manually tested
• Verified requirements are met
• Reviewed the code
• Reviewed the related tests

[ghost]

I could fix the race condition by doing something like this, what do you think about it?
handler/endpoint.go:102

- go e.opts.Proxies.Produce(subCtx, req, proxyResults)
- go e.opts.Requests.Produce(subCtx, req, requestResults)
+ go e.opts.Proxies.Produce(subCtx, req.Clone(context.TODO()), proxyResults)
+ go e.opts.Requests.Produce(subCtx, req.Clone(context.TODO()), requestResults)

[alex-schneider]

@malud, the race condition fix from develerik works for me nicely. but i would use reqCtx from line 71 instead of context.TODO(). what do you mean?

[malud]

This data races seems to be related to #323 .
I would like to fix the root cause, using TODO() is unfortunately not helpful since the required context (and cancels) are not available anymore for usage at backend/roundtrip level.
Additionally the Produce methods will clone the request already, so cloning them to clone them again seems to be not the best approach solving this one.

@develerik thanks for your contribution so far. We will look into this race condition since its unrelated to your changes and will give you asap a ping if we have solved this.

[malud]

thanks @develerik