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/docker.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Clone.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/linux.yml

@@ -59,7 +59,7 @@ jobs:
 
     steps:
       - name: Clone.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/mac.yml

@@ -56,7 +56,7 @@ jobs:
         run: echo "REPO_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
 
       - name: Clone.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
           path: ${{ env.REPO_NAME }}

.github/workflows/mac_packaged.yml

@@ -60,7 +60,7 @@ jobs:
         run: echo "REPO_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
 
       - name: Clone.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
           path: ${{ env.REPO_NAME }}

.github/workflows/snap.yml

@@ -47,7 +47,7 @@ jobs:
 
     steps:
       - name: Clone.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           submodules: recursive

.github/workflows/win.yml

@@ -72,7 +72,7 @@ jobs:
         run: echo "REPO_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
 
       - name: Clone.
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
           path: ${{ env.TBUILD }}\${{ env.REPO_NAME }}