infra: bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/anaconda_tests.yml

@@ -18,14 +18,14 @@ jobs:
 
     steps:
       - name: Clone Anaconda repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           repository: rhinstaller/anaconda
           path: anaconda
           ref: '${{ env.TARGET_BRANCH }}'
 
       - name: Clone current PR
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           path: blivet
           submodules: true

.github/workflows/check-rhel.yml

@@ -14,7 +14,7 @@ jobs:
       CI_CONTAINER: blivet-tests
     steps:
       - name: Checkout blivet repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install podman
         run: |

.github/workflows/check.yml

@@ -19,7 +19,7 @@ jobs:
       CI_CONTAINER: blivet-tests
     steps:
       - name: Checkout blivet repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install podman
         run: |