chore(deps): update wimpysworld/nothing-but-nix action to v6

[academy-renovate]

This PR contains the following updates:

Package	Type	Update	Change
wimpysworld/nothing-but-nix	action	major	v5 -> v6

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Release Notes

wimpysworld/nothing-but-nix (wimpysworld/nothing-but-nix)

v6

Compare Source

What's Changed

• fix(action): enhance environment checks for Ubuntu runners by @​flexiondotorg in https://github.com/wimpysworld/nothing-but-nix/pull/20
• ci: add more tests by @​flexiondotorg in https://github.com/wimpysworld/nothing-but-nix/pull/21
• fix: set TMPDIR to /nix/_temp to resolve build space issues. fixes #​18 by @​flexiondotorg in https://github.com/wimpysworld/nothing-but-nix/pull/22
• feat: add nix-permission-edict input for user ownership of /nix by @​flexiondotorg in https://github.com/wimpysworld/nothing-but-nix/pull/23

Full Changelog: wimpysworld/nothing-but-nix@v5...v6

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