chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/update-flake.yml

@@ -36,7 +36,7 @@ jobs:
       matrix: ${{ steps.build-matrix.outputs.matrix }}
       has-updates: ${{ steps.build-matrix.outputs.has-updates }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Setup Nix
         uses: cachix/install-nix-action@v31
       - name: Build update matrix
@@ -65,7 +65,7 @@ jobs:
           app-id: ${{ secrets.APP_ID }}
           private-key: ${{ secrets.APP_PRIVATE_KEY }}
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           token: ${{ steps.app-token.outputs.token }}
       - name: Setup Nix

.github/workflows/update-readme.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install Nix
         uses: cachix/install-nix-action@v30