build(deps): bump actions/checkout from 3.6.0 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.6.0...v4.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/update-flake-lock.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.0.0
       - name: Install Nix
         uses: cachix/install-nix-action@v22
         with:

.github/workflows/workflow.yaml

@@ -32,7 +32,7 @@ jobs:
           - false
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@v4.0.0
       - uses: cachix/install-nix-action@v22
         with:
           nix_path: nixpkgs=./docs/nixpkgs.nix
@@ -91,7 +91,7 @@ jobs:
           - macos-11
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@v4.0.0
       - uses: cachix/install-nix-action@v22
         with:
           nix_path: nixpkgs=./nixpkgs.nix