Backport of go.mod: go get github.com/hashicorp/terraform-svchost@v0.1.1 into v1.5

[teamterraform]

Backport

This PR is auto-generated from #33364 to be assessed for backporting due to the inclusion of the label 1.5-backport.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

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This includes a change to make svchost.Disco and the caching credentials source both safe for concurrent calls.

This fixes #33333.

[hashicorp-cla]

All committers have signed the CLA.

[apparentlymart]

Seems like something in the dependencies here has dragged us forward onto cty 1.13, which includes the refinements changes that Terraform v1.5 is not ready to accept. I'm going to see if I can find some way to avoid that upgrade here, but if not then we will probably just need to hold this fix for v1.6. That's not a huge deal since it's a bug that's relatively hard to hit, but it is a crasher so if we can't backport this then I'll spend a little time seeing if there's something more surgical we can do in v1.5, such as putting a mutex directly inside the terraform_remote_state data source.

[apparentlymart]

Unfortunately it's svchost itself that has the updated dependency, so I'm going to abandon this backport and pursue a safer fix for the v1.5 branch. We'll keep the main branch equivalent of this PR as the moving-forward solution for v1.6 onwards, since it uses more fine-grain locking that we won't be able to achieve just as a caller.

[github-actions]

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