chore: Nix: update Nix client to resolve https://github.com/NixOS/nix/issues/4469

.github/workflows/nix-ci.yml

@@ -21,10 +21,11 @@ jobs:
         include:
           - name: Linux
             os: ubuntu-latest
-            nix_url: https://hydra.nixos.org/build/130670999/download/1/nix-2.4pre20201117_ae31916-x86_64-linux.tar.xz
+            # latest builds on https://hydra.nixos.org/jobset/nix/master/all at the time
+            nix_url: https://hydra.nixos.org/build/135773533/download/1/nix-2.4pre20210125_36c4d6f-x86_64-linux.tar.xz
           - name: macOS
             os: macos-latest
-            nix_url: https://hydra.nixos.org/build/130670982/download/1/nix-2.4pre20201117_ae31916-x86_64-darwin.tar.xz
+            nix_url: https://hydra.nixos.org/build/135773542/download/1/nix-2.4pre20210125_36c4d6f-x86_64-darwin.tar.xz
       # complete all jobs
       fail-fast: false
     name: ${{ matrix.name }}

flake.lock

@@ -68,11 +68,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1605624824,
-        "narHash": "sha256-hJnqMzKKHjVrOTanOdb74kokOV/k5yFuQO2c2Jkm51A=",
+        "lastModified": 1611597793,
+        "narHash": "sha256-xL3NQJnuGvvay+PWFCQ3fShZHwmiy0PmgqHX6yFUX0M=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "ae3191666f1828d9694fb615a721d409fb8582bd",
+        "rev": "36c4d6f59247826dde32ad2e6b5a9471a9a1c911",
         "type": "github"
       },
       "original": {