Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

.github/workflows/tests.yml

@@ -24,7 +24,7 @@ jobs:
           ruby-version: "3.2"
           bundler-cache: true
       - run: ./scripts/test-gem-build gems ruby ${{github.ref_type}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: cruby-gem
           path: gems
@@ -55,7 +55,7 @@ jobs:
           docker run --rm -v "$(pwd):/re2" -w /re2 \
             "ghcr.io/rake-compiler/rake-compiler-dock-image:1.4.0.rc2-mri-${{matrix.platform}}" \
             ./scripts/test-gem-build gems ${{matrix.platform}} ${{github.ref_type}}
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: "cruby-${{matrix.platform}}-gem"
           path: gems