chore(deps): update determinatesystems/nix-installer-action action to v18

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
DeterminateSystems/nix-installer-action	action	major	v17 -> v18

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Release Notes

DeterminateSystems/nix-installer-action (DeterminateSystems/nix-installer-action)

v18

Compare Source

What's Changed

• Correctly suppress empty summaries by @​gustavderdrache in https://github.com/DeterminateSystems/nix-installer-action/pull/171
• Test penance by @​gustavderdrache in https://github.com/DeterminateSystems/nix-installer-action/pull/172
• Add hash mismatches to summary by @​gustavderdrache in https://github.com/DeterminateSystems/nix-installer-action/pull/173
• Fix an obscure error case where if the only log fails, the rendering is wack by @​grahamc in https://github.com/DeterminateSystems/nix-installer-action/pull/177
• Ditch the docker shim in favor of a double fork by @​grahamc in https://github.com/DeterminateSystems/nix-installer-action/pull/180
• Add a note about pinning by @​grahamc in https://github.com/DeterminateSystems/nix-installer-action/pull/182

Full Changelog: DeterminateSystems/nix-installer-action@v17...v18

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