chore(deps): update actions/checkout action to v5 (#6)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
   lint:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: DeterminateSystems/nix-installer-action@v19
       - uses: DeterminateSystems/magic-nix-cache-action@v13
       - name: Check formatting
@@ -26,7 +26,7 @@ jobs:
     runs-on: macos-15
     needs: lint
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: DeterminateSystems/nix-installer-action@v19
       - uses: DeterminateSystems/magic-nix-cache-action@v13
       - name: Show flake outputs
@@ -42,7 +42,7 @@ jobs:
       matrix:
         host: [higgins, benson, spaceblack, dunston]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: DeterminateSystems/nix-installer-action@v19
       - uses: DeterminateSystems/magic-nix-cache-action@v13
       - name: Evaluate toplevel drv for ${{ matrix.host }}

.github/workflows/flakehub-publish.yml

@@ -10,7 +10,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: "actions/checkout@v4"
+      - uses: "actions/checkout@v5"
       - uses: "DeterminateSystems/nix-installer-action@main"
       - uses: "DeterminateSystems/flakehub-push@main"
         with:

.github/workflows/gemini-pr-review.yml

@@ -76,7 +76,7 @@ jobs:
     runs-on: 'ubuntu-latest'
     steps:
       - name: 'Checkout PR code'
-        uses: 'actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683' # v4
+        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8' # v5
 
       - name: 'Generate GitHub App Token'
         id: 'generate_token'