Bump the action-deps group with 2 updates

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


Updates `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)

Updates `actions/download-artifact` from 4 to 5
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: action-deps
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: action-deps
...

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -88,7 +88,7 @@ jobs:
           - ubuntu-24.04-s390x
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4 # v5 fails on these platforms
+    - uses: actions/checkout@v5 # v5 fails on these platforms
     - name: Set up Ruby
       run: |
         sudo apt-get update
@@ -305,7 +305,7 @@ jobs:
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.target.ruby }}
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         name: gem-package
         path: pkg