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/ci.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install .NET 8.0
         uses: actions/setup-dotnet@v5
@@ -43,7 +43,7 @@ jobs:
 
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install .NET 8.0
         uses: actions/setup-dotnet@v5

.github/workflows/documentation.yml

@@ -52,7 +52,7 @@ jobs:
           echo ${{ needs.prepare.outputs.version_type }}
 
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ needs.prepare.outputs.git_tag }}
 
@@ -66,7 +66,7 @@ jobs:
           make all
 
       - name: Clone Wiki
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: openra/openra.wiki
           token: ${{ secrets.DOCS_TOKEN }}
@@ -107,7 +107,7 @@ jobs:
           echo ${{ needs.prepare.outputs.version_type }}
 
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ needs.prepare.outputs.git_tag }}
 
@@ -122,7 +122,7 @@ jobs:
 
       # version_type is release/playtest/bleed - the name of the target branch.
       - name: Clone docs.openra.net
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: openra/docs
           token: ${{ secrets.DOCS_TOKEN }}

.github/workflows/packaging.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Prepare Environment
         run: echo "GIT_TAG=${GITHUB_REF#refs/tags/}" >> ${GITHUB_ENV}
@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install .NET 8.0
         uses: actions/setup-dotnet@v5
@@ -68,7 +68,7 @@ jobs:
     runs-on: macos-13
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install .NET 8.0
         uses: actions/setup-dotnet@v5
@@ -101,7 +101,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Clone Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install .NET 8.0
         uses: actions/setup-dotnet@v5