ci: update Nix actions

Signed-off-by: Roman Volosatovs <[email protected]>

Author: rvolosatovs

.github/actions/install-nix/action.yml

@@ -7,14 +7,14 @@ inputs:
 runs:
   using: composite
   steps:
-  - uses: DeterminateSystems/nix-installer-action@v10
+  - uses: DeterminateSystems/nix-installer-action@v12
     with:
       extra-conf: |
         accept-flake-config = true
 
-  - uses: DeterminateSystems/magic-nix-cache-action@v4
+  - uses: DeterminateSystems/magic-nix-cache-action@v7
 
-  - uses: cachix/cachix-action@v14
+  - uses: cachix/cachix-action@v15
     continue-on-error: true
     with:
       name: wrpc