ci: bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/cachix.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install Nix
         uses: cachix/install-nix-action@v31

.github/workflows/check.yml

@@ -14,7 +14,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Rust toolchain
         run: |
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Rust toolchain
         run: |
@@ -47,7 +47,7 @@ jobs:
   stylua:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: JohnnyMorganz/stylua-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/draft.yml

@@ -39,7 +39,7 @@ jobs:
       CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_LINKER: riscv64-linux-gnu-gcc
       CARGO_TARGET_SPARC64_UNKNOWN_LINUX_GNU_LINKER: sparc64-linux-gnu-gcc
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install gcc
         if: matrix.gcc != ''
@@ -78,7 +78,7 @@ jobs:
       CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER: lld-link.exe
       CARGO_TARGET_AARCH64_PC_WINDOWS_MSVC_LINKER: lld-link.exe
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: dtolnay/rust-toolchain@stable
         with:
@@ -117,7 +117,7 @@ jobs:
     container:
       image: docker://ghcr.io/cross-rs/${{ matrix.target }}:edge
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: dtolnay/rust-toolchain@stable
         with:
@@ -147,7 +147,7 @@ jobs:
             arch: arm64
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -229,7 +229,7 @@ jobs:
           echo "Generated on: $(date -u +"%Y-%m-%d %H:%M") UTC" >> $GITHUB_ENV
           echo "EOF" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/download-artifact@v6
         with:

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Rust toolchain
         run: rustup toolchain install stable --profile minimal

.github/workflows/validate-form.yml

@@ -12,7 +12,7 @@ jobs:
     permissions:
       issues: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v6