Update cachix/install-nix-action action to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cachix/install-nix-action	action	major	v17 -> v26

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Release Notes

cachix/install-nix-action (cachix/install-nix-action)

v26

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Bump to Nix 2.20.5 to address CVE-2024-27297 / GHSA-2ffj-w4mj-pg37.

v25: install-nix-action-v25

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Nix 2.19.2

v24: install-nix-action-v24

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• Nix 2.19.1
• enables KVM on linux
• set TMPDIR to avoid potential disk space issues
• don't use the default GitHub token for Enterprise

v23: install-nix-action-v23

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• always show Nix trace
• Nix 2.17

v22: install-nix-action-v22

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• Nix 2.16.1
• Fix issues with System Integrity Protection when using macos-12

v21: install-nix-action-v21

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• pin Nix to 2.15.1 (recent releases broke too many things)
• fix the action to work on custom containers

v20: install-nix-action-v20

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https://discourse.nixos.org/t/nix-2-14-0-released/25900/4Fix support for Nix 2.14 new profile location: https://github.com/NixOS/nix/pull/5226

v19: install-nix-action-v19

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• expose github_access_token option and use the default github token by default to prevent rate limiting
• support --no-daemon installation

v18: install-nix-action-v18

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• Fix nodejs warnings & simplify maintenance
• Use python3 when determining number of cores
• Collapse installer log messages

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