Merge pull request #129 from serokell/update

flake.lock: Update

Author: balsoft

.buildkite/pipeline.yml

@@ -5,4 +5,4 @@
 steps:
   - label: Check Nix flake
     commands:
-      - nix-shell --run 'nix --experimental-features "nix-command flakes" flake check -L'
+      - nix-unstable flake check -L