deps(deps): 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] <[email protected]>

Author: dependabot[bot]

.github/workflows/RocketModFix.Unturned.Redist.Matrix.yaml

@@ -70,7 +70,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         # Fetches all history for the tj-actions/changed-files to work correctly on push
         fetch-depth: 0

.github/workflows/Update.Unturned.Redist.yaml

@@ -105,7 +105,7 @@ jobs:
           echo "BRANCH_NAME=redist-update/${{ matrix.variant }}-${timestamp}" >> $GITHUB_ENV
       
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: master
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/Verify.Redist.Update.yaml

@@ -23,7 +23,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Validate redist update
         run: |