build(deps): bump actions/upload-artifact from 3 to 4 (#17)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/generate.yaml

@@ -19,7 +19,7 @@ jobs:
           ./sloth-linux-amd64 generate -i ./examples/getting-started.yml -o ./examples/_gen/getting-started.yml
           ./sloth-linux-amd64 generate -i ./examples/no-alerts.yml -o ./examples/_gen/no-alerts.yml
       - name: 'Upload directory with generated SLOs'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: SLOs
           path: examples/_gen/