Update nixpkgs snapshot

[github-actions]

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[purcell]

@akirak These PRs are created automatically each week, but the Actions don't get run automatically, so I typically close and re-open the PR, then merge once done. We need to make sure the Actions have always run before code lands in master, otherwise cachix might not be fully populated.

[akirak]

These PRs are created automatically each week, but the Actions don't get run automatically, so I typically close and re-open the PR, then merge once done.

Yes, I know. That's one of the workarounds for create-pull-request action to trigger workflow runs. I use another way with PAT in my repositories, but this is your repository, so I will stick with the current way. Thank you for your explanation.

[purcell]

I'd be happy to change the process, since this means a manual action each week, just couldn't easily figure it out when I set this up.