bump go.mod to 1.20

[jar-b]

Description

Updates go.mod to Go 1.20. Also replaces package-scoped calls to rand.Seed() with randomized values, as Go 1.20 now seeds the global number generator in math/rand with a randomized value by default. From the 1.20 release notes:

The math/rand package now automatically seeds the global random number generator (used by top-level functions like Float64 and Int) with a random value, and the top-level Seed function has been deprecated. Programs that need a reproducible sequence of random numbers should prefer to allocate their own random source, using rand.New(rand.NewSource(seed)).

Relations

Relates #32082 (see failed checks).
Closes #30876.

[github-actions]

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[ewbankkit]

We may need to call out the potentially now unsupported platforms (see https://tip.golang.org/doc/go1.20#ports) in the release notes. Or maybe not. I can't remember how where our internal discussions landed on this.

[ewbankkit]

In theory we can replace uses of github.com/hashicorp/go-multierror with errors.Join: https://tip.golang.org/doc/go1.20#errors. Maybe open an Issue for this?

[ewbankkit]

Do we want to call out the DNS changes -- https://tip.golang.org/doc/go1.20#minor_library_changes -- as they are explicitly mentioned in #30876.
See e.g. UPGRADE NOTES in https://github.com/hashicorp/terraform/blob/v1.5/CHANGELOG.md#150-june-12-2023.

[ewbankkit]

LGTM 🚀.

[github-actions]

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[github-actions]

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