chore(deps): bump DeterminateSystems/update-flake-lock from 6 to 8 (#1147)

Bumps [DeterminateSystems/update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock) from 6 to 8.
- [Release notes](https://github.com/DeterminateSystems/update-flake-lock/releases)
- [Commits](https://github.com/DeterminateSystems/update-flake-lock/compare/v6...v8)

---
updated-dependencies:
- dependency-name: DeterminateSystems/update-flake-lock
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/update-flake-lock.yml

@@ -19,4 +19,4 @@ jobs:
             experimental-features = nix-command flakes
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v6
+        uses: DeterminateSystems/update-flake-lock@v8