Update CI workflow versions

.github/workflows/build.yml

@@ -15,9 +15,9 @@ jobs:
       uses: actions/checkout@v2
 
     - name: Setup Node.js
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v2
       with:
-        node-version: 12.x
+        node-version: 16.x
 
     - name: Yarn cache
       uses: actions/cache@v2
@@ -51,11 +51,11 @@ jobs:
       run: yarn
 
     - name: Install Nix
-      uses: nixbuild/nix-quick-install-action@v4
+      uses: nixbuild/nix-quick-install-action@v9
 
     - name: Setup Cachix
       if: github.event_name == 'push' && github.repository_owner == 'stephank'
-      uses: cachix/cachix-action@v8
+      uses: cachix/cachix-action@v10
       with:
         name: stephank
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'