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](actions/checkout@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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
           - elixir: 1.19.x
             otp: 28.x
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.otp}}
@@ -78,7 +78,7 @@ jobs:
           - elixir: 1.19.x
             otp: 28.x
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.otp}}
@@ -158,7 +158,7 @@ jobs:
       - name: Set git to use original line ending (Windows)
         if: runner.os == 'Windows'
         run: git config --global core.autocrlf false
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.otp}}
@@ -183,7 +183,7 @@ jobs:
     name: Static analysis
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: erlef/setup-beam@v1
         with:
           otp-version: 28.x

.github/workflows/docsite.yml

@@ -13,7 +13,7 @@ jobs:
       image: squidfunk/mkdocs-material
     steps: 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Build
         run: mkdocs build -s
       - name: Upload artifact
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Download artifact
         uses: actions/download-artifact@v6
         with:

.github/workflows/release-asset.yml

@@ -14,7 +14,7 @@ jobs:
     name: Validate release
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Validate version consistency
         run: |
           VERSION="$(cat ./VERSION | tr -d '[:space:]')"
@@ -34,7 +34,7 @@ jobs:
       version: ${{ steps.version.outputs.version }}
       is_prerelease: ${{ steps.version.outputs.is_prerelease }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Extract version info
         id: version
@@ -84,7 +84,7 @@ jobs:
     runs-on: ubuntu-22.04
     needs: build
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Needed for changelog generation