Update github workflows actions to latest versions.

Some of the github actions were deprecated, therefore we're simply
updating those to the latest versions in both `ci.yml` and
`release.yml`.

.github/workflows/ci.yml

@@ -15,11 +15,11 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@v22
-      - uses: cachix/cachix-action@v12
+        uses: cachix/install-nix-action@v26
+      - uses: cachix/cachix-action@v14
         with:
           name: crunchy-public
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: nix flake check
         run:  nix flake check --print-build-logs --keep-going

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Add Crystal repos
       run: curl -sSL https://crystal-lang.org/install.sh | sudo bash
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Add Crystal repos
       run: curl -sSL https://crystal-lang.org/install.sh | sudo bash
@@ -71,7 +71,7 @@ jobs:
     runs-on: macos-13
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Install crystal
       run: brew install crystal
@@ -98,7 +98,7 @@ jobs:
     runs-on: macos-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Install crystal
       run: brew install crystal