ci(deps): Bump actions/checkout from 4 to 6

.github/workflows/docs.yml

@@ -35,7 +35,7 @@ jobs:
     name: Markdown Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: markdownlint
         uses: DavidAnson/markdownlint-cli2-action@v18
@@ -53,7 +53,7 @@ jobs:
     name: Link Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Check for broken links
         uses: lycheeverse/lychee-action@v2
@@ -93,7 +93,7 @@ jobs:
     name: Documentation Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -128,7 +128,7 @@ jobs:
     name: Table of Contents Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Verify documentation structure
         run: |

.github/workflows/fuzz.yml

@@ -52,7 +52,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install Rust nightly
         uses: dtolnay/rust-toolchain@nightly
@@ -145,7 +145,7 @@ jobs:
     if: github.event_name == 'schedule'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install Rust nightly
         uses: dtolnay/rust-toolchain@nightly

.github/workflows/mdbook-gh-pages.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v2