Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/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/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/release.yaml

@@ -23,7 +23,7 @@ jobs:
         working-directory: target/release
         run: mv ironoxide-cli${{ matrix.ext }} ironoxide-cli-${{ matrix.os }}${{ matrix.ext }}
       - name: Upload artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: release-${{ matrix.os }}
           path: target/release/ironoxide-cli-${{ matrix.os }}${{ matrix.ext }}