build(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](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/create-release-package.yml

@@ -11,7 +11,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: "~3.25.0"  # <--= optional, use most recent 3.25.x version

.github/workflows/run-checks.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6

.github/workflows/run-tests.yml

@@ -9,7 +9,7 @@ jobs:
   test-on-ubuntu:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: "~3.25.0"
@@ -36,7 +36,7 @@ jobs:
   test-on-windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: "~3.25.0"
@@ -54,7 +54,7 @@ jobs:
   test-on-osx:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: "~3.25.0"

.github/workflows/update-dependencies.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Python
       uses: actions/setup-python@v6