Update action versions (#530)

Missed some versions in the previous release: 
cachix/cachix-action to v14 ->
https://github.com/cachix/cachix-action/releases/tag/v14

actions/cache to v4 ->
https://github.com/actions/cache/releases/tag/v4.0.0

---------

Co-authored-by: devops <devops@runtimeverification.com>

.github/workflows/test.yml

@@ -29,7 +29,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
 
       - name: 'Cache Stack root'
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: stack-cache
           key: stack-2-${{ runner.os }}-ghc-${{ env.ghc_version }}-${{ hashFiles('stack.yaml') }}-${{ hashFiles('package.yaml') }}-${{ hashFiles('stack.yaml.lock') }}
@@ -142,7 +142,7 @@ jobs:
 
       - name: 'Install Cachix'
         if: ${{ matrix.os == 'macos-12' }}
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: k-framework
           authToken: '${{ secrets.CACHIX_PUBLIC_TOKEN }}'
@@ -162,7 +162,7 @@ jobs:
           nix-store --query --requisites --include-outputs ${drv} | cachix push k-framework
 
       - name: 'Cache Cabal package database and store'
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             cabal-cache/packages

.github/workflows/update-deps.yml

@@ -38,7 +38,7 @@ jobs:
             trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
 
       - name: 'Install Cachix'
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: k-framework
           authToken: '${{ secrets.CACHIX_PUBLIC_TOKEN }}'