build(deps): bump actions/download-artifact from 4 to 5

Bumps [actions/download-artifact](https://github.com/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/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -240,7 +240,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           apt-get: libsqlite3-dev pkg-config
           mingw: sqlite3
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: source-gem
           path: gems
@@ -314,7 +314,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: cruby-${{ matrix.platform }}-gem
           path: gems
@@ -348,7 +348,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "${{ matrix.ruby }}"
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: cruby-${{ matrix.platform }}-gem
           path: gems
@@ -373,7 +373,7 @@ jobs:
       image: ruby:${{matrix.ruby}}-${{matrix.flavor}}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: cruby-x86_64-linux-musl-gem
           path: gems