build(deps): bump the actions group with 2 updates

Bumps the actions group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [actions/upload-artifact](https://github.com/actions/upload-artifact).


Updates `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)

Updates `actions/upload-artifact` from 5 to 6
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/rpm.yml

@@ -41,7 +41,7 @@ jobs:
           mock --rebuild --enablerepo=updates-testing rpms/*.src.rpm
           find /var/lib/mock -wholename '*/result/*.rpm' | xargs mv -t rpms
       - name: Archive RPMs
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rpms
           path: rpms/

.github/workflows/rust.yml

@@ -37,7 +37,7 @@ jobs:
           - s390x
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up environment
         run: .github/workflows/env-setup
         shell: bash
@@ -85,7 +85,7 @@ jobs:
           - s390x
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Detect crate MSRV
         shell: bash
         run: |
@@ -142,7 +142,7 @@ jobs:
           - s390x
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up environment
         run: .github/workflows/env-setup
         shell: bash
@@ -189,7 +189,7 @@ jobs:
           - x86_64
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up environment
         run: .github/workflows/env-setup
         shell: bash
@@ -230,7 +230,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up environment
         run: .github/workflows/env-setup
         shell: bash

.github/workflows/tmt-tests.yml

@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set additional paths
         run: |