deps: update dependency opentofu/opentofu to v1.8.6 (#793)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [opentofu/opentofu](https://redirect.github.com/opentofu/opentofu) |
patch | `v1.8.5` -> `v1.8.6` |

---

### Release Notes

<details>
<summary>opentofu/opentofu (opentofu/opentofu)</summary>

###
[`v1.8.6`](https://redirect.github.com/opentofu/opentofu/releases/tag/v1.8.6)

[Compare
Source](https://redirect.github.com/opentofu/opentofu/compare/v1.8.5...v1.8.6)

ENHANCEMENTS:

- OpenTofu builds now use Go version 1.22
([#&#8203;2050](https://redirect.github.com/opentofu/opentofu/issues/2050))

BUG FIXES:

- Extended trace logging for HTTP backend, including request and
response bodies.
([#&#8203;2120](https://redirect.github.com/opentofu/opentofu/pull/2120))
- The `tofu test` command doesn't try to validate mock provider
definition by its underlying provider schema now.
([#&#8203;2140](https://redirect.github.com/opentofu/opentofu/pull/2140))
- Type validation for mocks and overrides are now less strict in `tofu
test`.
([#&#8203;2144](https://redirect.github.com/opentofu/opentofu/pull/2144))

</details>

---

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---

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---

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.github/workflows/test.yml

@@ -67,7 +67,7 @@ jobs:
 
       - uses: opentofu/setup-opentofu@v1
         with:
-          tofu_version: v1.8.5 # renovate: datasource=github-releases depName=opentofu/opentofu
+          tofu_version: v1.8.6 # renovate: datasource=github-releases depName=opentofu/opentofu
           tofu_wrapper: false
 
       - uses: docker/setup-buildx-action@v3