Nix Cleanup (#422)

* chore: nix cleanup

* Bumpup nix CI

* nix: update sha256

Author: GTrunSec

.github/workflows/checks.yaml

@@ -8,10 +8,10 @@ jobs:
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v2.4.0
       with:
         fetch-depth: 0
-    - uses: cachix/install-nix-action@v14
+    - uses: cachix/install-nix-action@v15
       with:
         install_url: https://github.com/numtide/nix-unstable-installer/releases/download/nix-2.5pre20211026_5667822/install
 
@@ -24,7 +24,7 @@ jobs:
     - name: Build emacsNg Rust Dependency
       # remove when nix build is fixed
       continue-on-error: true
-      run: nix -Lv build .#emacsNg-rust
+      run: nix -Lv build .#emacsNG-rust
 
     - uses: cachix/cachix-action@v10
       with: