chore(deps): update dependency opentofu/opentofu to v1.8.5 in dockerfile (main)

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
opentofu/opentofu	patch	1.8.4 -> 1.8.5

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Release Notes

opentofu/opentofu (opentofu/opentofu)

### [`v1.8.5`](https://redirect.github.com/opentofu/opentofu/releases/tag/v1.8.5) [Compare Source](https://redirect.github.com/opentofu/opentofu/compare/v1.8.4...v1.8.5) #### BUG FIXES: - Provider functions will now handle partially unknown arguments per the tfplugin spec ([#​2127](https://redirect.github.com/opentofu/opentofu/pull/2127)) - `tofu init` will no longer return a spurious "Backend configuration changed" error when re-initializing a working directory with existing initialization of a backend whose configuration schema has required arguments. This was a regression caused by the similar fix in the v1.8.4 release. ([#​2135](https://redirect.github.com/opentofu/opentofu/pull/2135)) **Full Changelog**: https://github.com/opentofu/opentofu/compare/v1.8.4...v1.8.5

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