Bump actions/checkout from 3 to 6 (#77)

Author: purefunctor

.github/workflows/checks.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Rust toolchain
         run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
@@ -55,7 +55,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Rust toolchain
         run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
@@ -89,7 +89,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Run formatter
         run: cargo fmt --check

.github/workflows/docs.yml

@@ -13,7 +13,7 @@ jobs:
           - stable
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
     name: Create GitHub Release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: taiki-e/create-gh-release-action@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install cross-compilation tools
         uses: taiki-e/setup-cross-toolchain-action@v1