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/build.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Create build directory
       # Create build directory
@@ -41,13 +41,13 @@ jobs:
       image: fedora:rawhide
       options: --security-opt seccomp=unconfined
     steps:
-      # Install git and other tools first to be able to use 'actions/checkout@v5' properly
+      # Install git and other tools first to be able to use 'actions/checkout@v6' properly
       - name: Install required packages
         run: dnf install --nogpgcheck -y tito gcc make cmake git-core
 
       # Clone repository and set everything for building of RPMs
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # This step is required so Tito can properly read git history
       # See https://github.com/actions/checkout/issues/766