Update actions/checkout action to v6 (#124)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Biome
         uses: biomejs/setup-biome@v2
         with:
@@ -21,7 +21,7 @@ jobs:
   type-safe:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v6
         with:
           run_install: true # package manager version is in package.json
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - uses: pnpm/action-setup@v6
         with:
           run_install: true # package manager version is in package.json

.github/workflows/deploy.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - uses: pnpm/action-setup@v6
         with:
           run_install: true # package manager version is in package.json

.github/workflows/fetch-event-node.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       # Step 1: Check out the repository code
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       # Step 2: Set up a Node.js environment
       - uses: pnpm/action-setup@v6
         with: