deps: update dependency opentofu/opentofu to v1.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
opentofu/opentofu	patch	v1.8.0 -> v1.8.1

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Release Notes

opentofu/opentofu (opentofu/opentofu)

### [`v1.8.1`](https://togithub.com/opentofu/opentofu/releases/tag/v1.8.1) [Compare Source](https://togithub.com/opentofu/opentofu/compare/v1.8.0-beta1...v1.8.1) #### What's Changed - Fix missing module source panic ([#​1888](https://togithub.com/opentofu/opentofu/issues/1888)) in [https://github.com/opentofu/opentofu/pull/1889](https://togithub.com/opentofu/opentofu/pull/1889) **Full Changelog**: https://github.com/opentofu/opentofu/compare/v1.8.0...v1.8.1

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Configuration

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