chore(nix): Bump dependencies.

[dhess]

This should fix the issue we were having with intermittently failing
builds due to a nix-darwin issue.

It also fixes the issue we were seeing where entering the nix develop
shell was updating flake.lock, which is related.

[dhess]

The first build of this PR failed with strange errors like this one:

https://buildkite.com/hackworthltd/primer/builds/19#54ea18c1-b7b0-4558-9d81-dee1289dd067

/nix/store/sw5yg99apcanb4fdcza1pz98i2av9dp6-primer-test-primer-test-0.7.0.0.drv
--
  | don't know how to build these paths:
  | /nix/store/sw5yg99apcanb4fdcza1pz98i2av9dp6-primer-test-primer-test-0.7.0.0.drv
  | error: cannot build missing derivation '/nix/store/sw5yg99apcanb4fdcza1pz98i2av9dp6-primer-test-primer-test-0.7.0.0.drv'
  | 🚨 Error: The command exited with status 1

FYI, that happened because the build took awhile, and between the step where the Buildkite plugin built the derivations (.drv files) for each package in the build and the step(s) where those .drv files were finally used, the garbage collector ran and deleted those .drv files from the Nix store! This is a known issue with the Nix Buildkite plugin: circuithub/nix-buildkite-buildkite-plugin#1

This is the first time this has happened to us, but it probably won't be the last. I will set the GC to run less often: the builder has plenty of space and can probably run for at least a month before we need to GC. However, longer term we'll want to figure out a better solution to this.