build(deps): update determinatesystems/nix-installer-action action to v20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
DeterminateSystems/nix-installer-action	action	major	v19 -> v20

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Release Notes

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

v20

Compare Source

What's Changed

• Update detsys-ts: Merge pull request #​106 from DeterminateSystems/fix-dependabot-warning by @​detsys-pr-bot in #​194
• Update detsys-ts: Capture the version of Nix in addition to the nix store version (#​108) by @​detsys-pr-bot in #​197
• Report the number of nix builds that passed / failed by @​grahamc in #​196
• Record events if authentication is skipped by @​gustavderdrache in #​198
• Treat FlakeHub logins as a funnel by @​gustavderdrache in #​199
• Apply fixups from CodeRabbit review by @​gustavderdrache in #​200

Full Changelog: DeterminateSystems/nix-installer-action@v19...v20

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